I stayed for one night before my flight out of Madrid, and I definitely enjoyed it and would stay again. It would be perfect for one or two people. The walls are a bit thin, but with earplugs I slept great. It’s on the fourth floor of the apartment complex so expect some walking up stairs, and the area isn’t the “most glamorous”, but I was close to the main city center and the Reina Sofia museum and never felt unsafe. Overall, would recommend staying here!