Long story short: this is the perfect place to stay when visiting Venice, recommendable to everyone. The apartment is beautiful, with a nice common area and tea kitchen (no cooking though). Probably the best thing about the place is its fantastic location in the heart of the city, where nearly all points of interests are a 15-minute walk away (even the Accademia on the other side of town is only 20-25 minutes away).
The only complaint we have are in fact the beds. The mattresses seem to be only foam and are incredibly soft, you basically sink into them when sitting or lying on the beds. We got used to them in the end and slept well, but it could be difficult for someone with very specific bed needs. In any case we'd stay here again in the future!