Whilst no-one can deny the impressive 74,500 Millennium Stadium is a fine venue for any soccer showpiece, eyebrows everywhere have been raised at the realisation that Cardiff is a little on the small size as a city (population 340,000) and does not have a major airport nearby.
Cardiff-Wales airport flies a summer timetable largely to beach resorts. Hopefully there will be extra flights laid on from Madrid and Turin, the two finalist cities.
Whilst the Welsh capital has experience of dealing with F.A. Cup finals, Football League playoffs and football and rugby internationals, the tens of thousands expected for European football's showdown will be coming from overseas via London so there must be plenty of transport options before and crucially after a game which could go on through extra-time and maybe penalties.
Given local hotel rooms for the night have been jacked up to outrageous rates, a depressing occurrence whenever a big sporting event happens, most will be leaving Cardiff the same night.
With only 4000 hotel rooms, all booked up some time ago, there is little option other than car hire and hotels further afield, or in one of the tents specially erected in a city park, Pontcanna Fields.
The now customary Final Festival will take place around a mile away in Cardiff Bay as the Millennium Stadium itself sits in the very tight streets of the city centre, which of course is a fabulous location for so big a venue. Fans arriving by train at Cardiff Central will see its looming stands and cantilevers as soon as they exit the station.
Unlike at Wembley or other out-of-town venues, there are plenty of bars and eateries within a stone's throw of the stadium. If it is a sunny day, Cardiff's ample urban parkland, particularly Bute Park beside the castle will provide a great place to relax and have a kickaround.
The centre has two main avenues. Fans will probably stroll down the pedestrianised Queen Street but not linger in the shops. St Mary Street leading to the castle is mostly bars and restaurants and will be buzzing on final day however.
The castle, originally Roman but added to by Normans and others, most notably the C19th coal baron the Marquess of Bute, is the one photo stop every visitor will make, its impressive outer walls now surmounted by a blue UEFA dragon clasping the Champions League trophy.
There will be road closures and plenty of police but if everyone is relaxed the visiting supporters will enjoy the occasion.
I have travelled to Cardiff from London by train on big match days before and found long queues at Paddington Station for passage to the Welsh capital. Pre-booking is of course advised but the fact so many Italians and Spaniards will be landing that day in London none the wiser will surely mean the railways and bus lines need extra capacity.
21 post-match trains to London have been promised and I hope that will be enough.
In changing the final from Wednesday to Saturday and adding a festival for a few days around it, UEFA have consciously tried to ape the Superbowl, increasing the price of tickets concomitantly, to make it a global event.
As much as I love Cardiff, it is not a city on the large side. Only Gelsenkirchen, the 2004 host, was a smaller place but Schalke's home is close to several other German cities in the most densely-populated part of that country.
Near to Cardiff there are only other modestly-sized cities like Swansea, Bristol and Bath. The only realistic result is that many will hop back on the London train after the match, meaning four hours of travelling on the day instead of soaking up the atmosphere of the host city.
London remains the major pull for overseas fans like it is for visitors. Travelling around Euro '96 it was clear many foreign fans were basing themselves in the capital and returning from Birmingham and Nottingham if not further afield after matches finished.
I am sure it will be all right on the night but I just hope UEFA have been adamant enough that the travelling fans, the frequently neglected factor in modern football, will enjoy the experience as much as the corporate guests, UEFA family and billion-odd TV viewers.
In the rush to make football big business, the supporters who make the effort at short notice to get off work and jet across to another country at some expense to fill the seats and cheer millionaire footballers, are usually the last to be considered.
The other issue if course security given the heightened threat of a terrorist attack on a high-profile European event. 1,500 police will be on hand to ensure nothing untoward occurs and the city did successfully host a NATO summit in 2014.
The city expects 170,000 visitors on the day, although that can only be rough guess. The Fan Zone in Coopers Fields can hold 7,000 and the Football Village in Cardiff Castle another 2,000. Down in the bay area, a Champions League museum will be open in the Wales Millennium Centre.
Many living nearby will be tempted to drop by to savour the unusually Mediterranean atmosphere.
Coming a year after Wales stunned the world by reaching the semi-final of Euro 2016, despatching the highly-fancied Belgians 3-1 in the quarter-final most notably, having the final of the European Cup in Cardiff constitutes something of a golden age in one of Europe's forgotten football corners.
Scotland remains far more famous overseas than Wales despite being of equal political status, so every piece of international fame can only be good for the local economy. I used to have to explain where Wales was to many a European but hopefully that has changed now.
Despite boasting an excellent castle, museum, parks and pleasant urban landscape as well as quick access to the Brecon Beacon mountains, the idyllic Gower Peninsula and other fine fortresses like Caerphilly, Cardiff remains a little off the standard tourist track for visitors to the UK because it is in the west of the island.
Doctor Who is filmed there but pretends it is London or various alien planets.
While Cardiff has a small Italian population, as shown by a number of family-owned ristoranti and Italian surnames in South Wales, and Juventus are the traditional team for Italian immigrants and their offspring, the fact local boy done good Gareth Bale is at Real Madrid will surely sway the majority of locals into backing the Spaniards.
Whether the Cardiff-born star can be fit in time for his big night on his home turf remains in doubt however.
A fit Bale or not, Cardiff will surely put on a good show and make a night to remember.
(c) Sean O'Conor & Soccerphile