I've been to the CL final city twice, Lisbon 2014 and Berlin 2015. The city atmosphere is amazing during the entire week. If you can do it you should check out the UEFA Champions Festival to take pictures with the CL Trophy, watch a legends match, buy a Juventus CL Final shirt and other stuff. Its a free Festival and in Berlin they also had the Serie A trophy there.
During the match they wont broadcast it on the big screens they have at the Festival, it looks like its up to the city to do that. Lisbon had 2 places for it, one for Real Madrid fans and the other one for Atletico. Berlin didnt have any of that so I ended up going to a pub to watch it, but before the game juve fans gathered around Alexanderplatz and it was incredible, check youtube for some videos of that.
So I think its worth going to the CL final city, specially with juve playing it, and I would do it every year. I missed last year because american airlines $#@!ed up my plane tickets reservation and this year accommodations and plane tickets are too expensive so I'll go to Torino if I get my renewed passport next week. To avoid the problems I'm having this year I already booked a room for Kiev 2018. I hope juve reach the final again