I stayed with Guillermo for almost 2 months. I used the kitchen religiously without any problems. The washing machine is in the private bathroom, but it was never an issue. There's rooftop access for a clothes line. The living room is adjacent to the bedroom so you can hear the TV, but it didn't bother me and Guillermo was respectful about noise level. He wasn't overbearing and respected my privacy, yet was receptive to company if I wanted to hang in the living room with him or had questions about anything. We went out together a few times for dinner or to visit a park. For me, it was like having a compatible roommate.
What I liked most about the area was the convenience to the airport since I had booked some early flights around Europe during my stay. Bus 200 picks up across the street from Avenida de America and starts toting people to the airport at 5AM for 1.50€. It's quick and an incredible value.
I spent a month in Lavapies before moving here so what I liked least about the area was not having the same accessibility and variety of a more centrally located neighborhood. Everything is a little bit further away to walk to. On the flip side, when the weather was nice, I enjoyed a long stroll to Retiro or somewhere like the Fundación Juan March.
Enjoy your stay :)