We had a great stay at Ruben's place! The bed is supernice, the shower is amazing and the place is very centrally located. Everything we needed was in the apartment (water heater, hairdrier, cooking equipment, etc.). Ruben is a super nice host, he was very responsive and gave us some good recommendations (for a barber among others). In brief, I would recommend the place to everybody, and book the same place if I would go back to Madrid.