Had a very good stay at Maria's. She has the place set up well for hosting Airbnb guests. Very organized. I liked the warm toilet seat :), and, more importantly, the backyard was nice to take some wine and my laptop down to do some work in the evening. Everyone I met was nice and respectful and the room was quiet. Maria was very nice and greeted me when I arrived, even though I think she had a cold.
It was close to my conference around the Union Square area. I was walking to the conference hotel at 3 or 4 AM and had no problems, but if you don't like homeless people, you might not feel the same way. You'll see quite a few on the walk between the Airbnb and Union Square.