Diana's place is great. She is a super lovely and warm person who makes sure that you are feeling at home at her place. Any issues are addressed and fixed immediatley and she is a very lovely host who takes great care of you.
The appartment is cozy and very comfortable to stay in - everything you might need is close by and it takes only 20 min to get to the city center.
I highly recommend staying here if you are looking for the perfect base for exploring Madrid!