Great place to stay. We had the most amazing time staying in Tirso de Molina and we met some very friendly travelers there as well. It’s a fantastic location for Madrid because it’s a 5 minute walk to all the notable places in the city including Puerta Del Sol and Plaza Mayor.
The place was very accommodating and clean, the only issue is I’m 6’5” and the showers were small but manageable.
The only negative was that while we went during the heat wave, the “AC” listed was just a narrow fan, so we had some very sweaty nights. We managed but that’s just one thing to keep in mind. I wouldn’t trade ac for the great people we met in the flat however. The experience overall was amazing.