Celina's place is very clean and offers a lot of privacy. It is located very centrally between the university and a hip part of town, and most of Madrid is only a short walk away. Additionally, there is a subway station and bus stop across the street.
Celina is a great host. She knows Madrid like the back of her hand and is happy to offer up tips. She is happy to give you your privacy as well. All in all a great AiBnB.