You cannot beat this location, space and price! The apartment is literally less than 100mt from San Marco and still for its location in a quiet alley, it is not crowded or noisy. It is super spacious for two couples and the cleanliness and laundry option was a must for us, traveling in August. We could go back after lunch for 2h nap and back on the streets for more walks, dinner and gelato without affecting our schedule (so conveniently located!). I will certainly return in my next visit. This was my 3rd time in Venice and by far it was the best location to stay. Host was always quick to answer and very helpful.
From San Marco Vallaresso there are no stairs to climb and by walking across San Marco square you are in the apartment in 5’. Visit!