Really great location, a minute from PUERTA DEL SOL, we almost didn't use the metro as everything was within a walking distance, and we were with our 7 years old boy...
The location is very central, so it was great to open the windows and watch all the people below and the Christmas lights, but don't worry about the noise because you won't hear anything when you close them.
We didn't use the kitchen or refrigerator, but it seems crammed with stuff if you do. It is very convenient and clean, and the instructions were very clear and detailed, especially the short videos that demonstrate everything step-by-step, we will happily stay here again next time we will be in Madrid.