Our stay at Monica's apartment was lovely. The location was perfect-very close to the Rialto bridge (5 min walk), but still off on a quiet street. St Mark's Square was an easy walk as well (15 mins or so). It was very clean. The air conditioning felt wonderful after being out in the summer heat.
There are a restaurants on the same street as the apartment and a large fish/veggie/fruit market a few mins away.
We walked everywhere (many miles a day), but you can buy a water bus ticket to hop on and off if you prefer since there are many stops around Venice. One stop is just down the street by the market. Monica was very helpful in directions, Venice can feel like a maze of streets!
Monica left us juice, milk, fruit cereal and bread-all a nice touch for our first breakfast in Venice!