Looking for room madrid downtonw (CHAMBERI-EMBAJADORES)

Greetings, Im Renan, 29 years old and an aerospace engineer currently looking for a room in downtown madrid. I love urban dances, watching movies, cooking with my flatmates and explore new ways of living life. 

My budget is around 450-550 and I need a contract and empadronamiento (minimum stay of 4months) ENTRANCE IN DECEMBER