I arrived in Madrid for the first time and was unable to connect to the internet with the SIM I bought in Portugal, so I got lucky and took the right bus and managed to find the place very quickly. Someone let me in the building and I was relieved I picked a place close to the airport. I asked for some water but tap water has funny look and smell, so I did not drink anything until I left. Bed, pillows and sheets were not very comfortable , but I got a few hours of sleep, woke up and left. I never did meet Cristian. I would recommend his place as a cheap place to crash near the airport.