We booked what was a seemingly good Airbnb a few blocks off San Marco, the host met us promptly, and our stay was okay for the most part, but a few things really ruined this experience (and this was our only bad experience to date):
1. There are a set of 3 up and down steps just outside the bathroom, polished wood floors, the bottom floor slopes down by a large decline and is extremely slippery. My partner fell on his tailbone coming out of the restroom in the evening. This is hazardous and a rug or antislip pads are necessary.
2. There was an ant invasion into the kitchen, despite our efforts to clean up after each meal and take all garbage down in sealed bags. They seem to be crawling from cracks underneath the wall and cabinets. By the third evening they made it to the bedrooms despite our pesticide efforts.
3. We arrived at the apartment and it was incredibly hot because the heaters were on, we didn't mind this so much because it was a mistake of the last tenant, but the single a.c. unit is insufficient to cool down the master bedroom in the summer because there is a lot of attic space and the position of the a.c. vent aims to the room with the pullout couch.
4. Because of the intolerable heat we slept in separate rooms along with using the floor fan. I used spare sheets on the pull out couch and slept there. Little did I know this was somehow forbidden--the host called the airbnb hotline to complain about us sleeping on the raggety futon using extra sheets, and I received a rather confusing and stern complaint email during transit after checkout. This put the lid on the coffin.
In sum the location and apartment was good, but the experience was very poor.