We really enjoyed our first visit to Madrid. The apartment location is perfect, we didn't wish to have better. You're literally landed in the heart of city, very close to all central tourist sites, around 5~10 mins to walk. Maria is very responsive host and she kindly provided us with lots of tips about places to visit or eat.
However we cannot give the five points to the property because of several thing must be improved. The main problem we faced with at the first night on our arrival and it actually continued until our departure is hot water problem. Initially there weren't hot water in the bathroom at all and host didn't mention about how to switch it on, just was telling me to wait around 10 minutes until hot water will appear. it didn't work and we couldn't take shower first night. At next morning only I figured out how to open it. And then still the hot water flow in all bathroom taps was extremely weak. The mattress in bedroom was definitely very uncomfortable as well coach in living room. Absence of shower curtain and broken tap in the kitchen also wasn't so pleasant. I also would suggest to remove host's personal stuff from wardrobe in order to allow guests to keep their stuff in it as well as to remove bunch of plastic containers with unusable stuff, which placed in different places in the apartment.
Additionally I would suggest to provide Wi-Fi Internet connection.