This is a relatively small flat off the centre of Madrid. It's clean and simple, and was definitely a good choice for a longer, work-related stay like mine.
Miriam was really lovely. She is away a lot (which means one often just has the flat to oneself), but she always replied to my messages quickly. She was relaxed in her attitude and understanding when I happened to make mistakes. The furnishing of the room itself is simple, but Miriam gives you extensive access to the rest of the flat including kitchen, TV, and air conditioning. None of the furnishings are very new, but they are functional and absolutely sufficient.
Be aware that this flat is located on the second floor of a building with no elevator. There are several supermarkets nearby as well as a nice little park, but I found the options for eating out somewhat limited. The bus station is almost directly outside the door and takes you just about anywhere in 20-40min.