Mabel's apartment was located just around the corner of Atocha station. An area always busy with people coming and going. Surprisingly, her place is as quiet as it gets, specially being at ground level. The apartment is nice and functional, the bedrooms are big and the kitchen/hall is large enough for enjoying it, where the restroom may be on the cozy side (not that you will spend too much time there).
Mabel and Flor were warm and nice, waiting for the check-in and explaining a bit about the apartment.
If you need to use the Atocha station and/or are traveling with a couple of friends, this is a good option.