My boyfriend and I stayed for three days in the loft of Sergio and we liked it very much in particular for the comfortable position of the metro station which is 1 minute walk by the the flat. The only problem was to pick the keys of the flat from the shop in the street were he left them for us: the guy of the shop seemed not to know anything about the keys and we had to wait for Sergio to open the house. One hour later another guy of the shop found the keys and we solved the problem..5 minutes before the poor Sergio arrived!
The flat was comfortable and Sergio left for us the pc and there was also air conditioning which was really useful in August in Madrid!