Teresa was very welcoming and even stayed up late for my arrival. The room is perfect for one! Two negatives: the only window in the room is opposite the neighbor's kitchen so you deal with the cooking late into the night (as late as 2 a.m.);and due to the temps nearing 40C (100F), the room was extremely hot.
The location is super: 5 minutes from the train station and within walking distance of almost everything one would want to see in Madrid.
Teresa did a great job of making me feel at home and helped find a couple of places.