I stayed in The Punset Family's apartment in Madrid with 3 friends from July 29 - August 1 and it is really a fantastic apartment! Very clean, modern and comfortable and it is in an excellent location close to restuarants, supermarkets and the metro station.
Roberto Punset is a great host. He met us when we first checked in and gave us a lot of information about Madrid, where to go and what to see.
I would recommend anyone who is going to Madrid to stay at the apartment and I would stay there again if I am lucky enough to see Madrid again :-)