IO,
I was given this line back in April. We'd landed at Bologna, and the intention was to then spend a night in Venice on the way back, so I checked (in writing) that they'd have both parking and AVGAS.
Just to be on the safe side, I got the guys at Bologna handling to call before we took off : guess what, no AVGAS and no parking ... San Nicolo was also out, because it was Monday (and an awful lot of them close on Mondays, as you probably know). We gave up, refuelled at Linate and came home.
Good luck, and let us know if you go, because I'd very much like to go back myself.
FF
