I was one person and had great time at the apartment for one night.
The apartment is great for 1-2 people, and the best thing about it is its location, which is very close to San Marco Square (1 minute by foot). Nevertheless, it is quite (opens to a small backyard), clean and lovely.
The instructions I received to get there were informative and accurate.
Riccardo is a charming host - very helpful and kind.
I therefore highly recommend staying there.