My wife and I stayed at Marta's for 3 months with our 1 year old. She truly went above and beyond what any other host might do to make us comfortable. The place has everything you need for a long or short stay, such as a washer, extra hanging shelves and drawers in the closets to organize your things, and all the kitchen utensils you could think of plus more. Very notably, every nook and cranny of this entire apartment was impeccably clean (coming from two germaphobes). The neighbors are quiet, the bedrooms are quiet, and the location of this apartment simply cannot be beat. The apartment is right off of a very popular street lined up and down with outdoor terrace eating, and you can see all the awesome action and beautiful buildings from the balcony- but you are just far enough away that you can sleep without any disturbances. You can reach every part of central Madrid pretty quickly by walking. I would stay here every time I visit Madrid if I could.