I stayed at Pedro's place for about a month and it is a good place in a safe environment, and overall a good location within Madrid. The place is clean, bright and quiet with a good WIFI connection that allows you to work from home. There are 5 others living in this apartment, but it was never crowded and there was not a lot of interaction during my stay. Two things that I would have expected to be a little better for the price are the equipment in the kitchen and the bed frame/mattress.
All in all, I can recommend the stay at Pedro's place since the room contains everything you need, including AC for warmer days, and is located very nicely.