Great stay! Perfect location in Lavapiés, which is one of the most unique Barrios of Madrid. The apartment looks out to a little square with a bar (a little noise but not to worry at all) and a lovely wall painting. The connection to anywhere else is perfect, too. The apartment itself has a cool vibe, could use a little update here and there but who cares when you are in Madrid, hey. We stayed as a group of 4 (no couples), bed situation is OK but the 4th person definitely should use the sofa couch as the double bed could only sleep two if you are really tiny or crazy in love. Communication in advance was flawless! I think we will be back :-)
PS: on day of departure we used the luggage storage option (for free) at MIT offices in Chueca. Nice bonus.