Real and Atletico Madrid won the two cup competitions in 2018.
In 1994 AC Milan won the European Cup and Internazionale won the UEFA Cup. There was then also the Cup Winners' Cup though, which was won by Arsenal. Not sure there's ever been any other such instances though.
If there are no fans, or not many fans, the Ricoh Arena in Coventry is about halfway between the two. Alternatively, I'm sure Nuneaton Borough would be happy to stage the Champions' League Final at Liberty Way, although the press facilities might not meet the relevant criteria. Wikipedia does however confirm there is a sizeable car park.