Our stay here was incredible - the apartment (if it can be called that) is not even done justice by the pictures. It was akin to walking back in time or staying in a well maintained museum of exactly what you think of when you picture Venice (perhaps that's just me, but everyone in our party agreed.) Quite easy to get to, as it is close enough to the vaporetto, but on a quieter side-canal. During the day the gondolas pass by as a part of their regular route, sometimes singing, sometimes just silently gliding - all which can be observed from the balcony. At night the area and canals are quiet, making for restful sleep.
I cannot speak for all the beds, though I heard no complaints, but I stayed in the mezzanine area above the library and was quite comfortable. The linens were fresh and clean towels provided in every room and the bathrooms all clean. For the feeling of staying in a museum, it had the perks of modern cleanliness! I would go back to this apartment in a heartbeat. (The only thing to note is that, as with all places with no screens in mosquito season when you are up later than the sun, we did get a few bites at night. Never the less, I highly recommend staying here!)