Niccolo's place is a gem in Venice, you have the most spectacular view and not one but two for Venetian standard huge terraces. The decoration is lovely and traditional Venetian, Fortuny lamps, glassware, lovely decorational terracotta. I slept like a baby on the sofa bed, and we were two couples traveling so both sofa beds were fine and actually surprisingly comfortable.
If you are a light sleeper the proximity to the many church towers might be an issue ( My husband woke at 5am with the first bells :) I slept soundly till 9.
Not Niccolo's fault at all, but arm yourselves against mosquitos. I counted 38 bites, and when traveling especially with small children I can see that being a possible issue. All 4 of us got severely bitten.
The apartment is easy enough to find, just off San Marco and therefore easy to reach by boat or on foot.
Only minor issues were check in, despite giving a pretty accurate ETA and writing 1hr in advance to confirm no one was at the apartment to meet us.
Also the early check out was a bit of a bummer as luggage could not be left.
Overall would recommend, nice, clean, excellent NEW bathroom, for a few days a perfect little Venetian hide out.