BRING YOUR EAR PLUGS! It's on a very popular street called Hortaleza. The flat is one of 5 in a corridor. Originally it was a giant apartment that was then allocated to smaller units. Therefore, you will hear when the neighbors come home and smell what they are cooking. My first night was San Isidro holiday where everyone was out drunk and singing until 4am. I didn't sleep an hour. I have videos of how clearly I could hear people talking on the street. I forfeited my 2 weeks stay because I am Madrid for work and could not afford NOT to rest. Jorge is very nice and contacted the owners about my situation but I haven't heard back. If you are a university student you won't mind. Best of luck.