The Bar/Lounge at Hotel Colombina
The bar/lounge at Hotel Colombina is acknowledged by expert reviewers. Of the 2 reviews tracked on TripExpert, 2 mentioned the bar/lounge, including Oyster and Star Service.
Hotel Colombina 
Oyster
Star Service
Oyster "Another upscale hotel, the Hotel a La Commedia is more expensive and not located on a canal, but has a lovely outdoor rooftop bar"
Star Service "The tiny reception area drops down to a small lounge with no real view of the canal"
