The real selling point for us about Marta's apartment was the location. We were able to walk to all the main sites and when we did need to take the metro to go further out of the city, there are a few metro stations within a 10/15 minute walk. The neighbourhood was quiet during the day and came alive at night, but we didn't hear any noise from the bedroom so we weren't disturbed by that. It is a quirky apartment and we really enjoyed our stay there and in Madrid.