Maria Teresas apartment was comfortable and spacious. The toilet space was tight so you will have to sit a bit sideways but it didn't bother us. The apartment is on the ground floor, at the back, on a street with many popular restaurants and bars. On weekends especially you will find large crowds of people in the area. However you cannot hear a thing inside the apartment (the walls must be very thick). There is noise from the apartment / stairs above (footsteps etc) but nothing abnormal or during sleeping hours. There are a couple of train stations nearby, walking distance and it's only 1 stop to Atocha, and also on the same line as Chamartin. We only stayed 2 nights but it suited our needs.