We were 8 staying on Juan Antonio's place. The place is big enough, near to market, shops, restaurants, metro, bus, museums, etc. We found the place clean, bedrooms enough and living room ok, kitchen fully stuffed and plenty of things in the fridge. 3 bathrooms were clean, stuffed and enough for all. Washing machine ok. Juan was very gentile, and always ready to help.
Only one issue we had, since there is no Air Conditioner (we were aware of it), it was not very convenient due to high temperatures in Madrid in August. The place has fans which of course helped out, but still warm.
Thanks Juan and we hope to comeback to your place.