We had a fantastic stay at Justina's apartment. She is so sweet (and so are her cats!) and she even made us lemonade and gazpacho on a hot day. The apartment is very clean and nice, has a great outdoor space where you can eat, and it's only a 5 minute walk from the metro and Avenida de America bus station. Plus there is air conditioning in the bedroom, so even in Madrid in the summer we were extremely comfortable. Highly recommend staying here, thanks again Justina!