Our stay at Julian's place was lovely: the flat was very clean, the location was excellent and Julian was lovely. Our train arrived in Madrid a few hours before the check-in time but Julian was very forthcoming and let us in earlier without any fuss at all. During our stay in Madrid, we could easily walk everywhere by foot so we had no complaints about the location whatsoever.
There were 4 of us, two couples, so the sleeping arrangements were of no issue -- one couple stayed in the bedroom and the other in the living room. The living room couch was very comfortable and we got a good night sleep both nights. The only thing worth mentioning is that the air conditioner in the living room seems to be a bit older than the one in the bedroom so it was just a little noisy -- not a big problem, just at night time we decided to turn it off and open the windows instead, as it was more quiet that way.
The bathroom was also very clean and comfortable; the only things we missed in there were a toilet brush (for cleaning the toilet) and a trash can (for the ladies) but this was such a small issue that it didn't really take away from our stay and we would definitely stay again, when in Madrid next time! :)