The apartment is well located - most of the tourist attractions, museums, Atocha station are within walking distance, there is also public transport (metro) close by. A lot of shops, bars and restaurants in the area. Nice neighbourhood, unfortunately a bit noisy in the night (garbage collection, late coming back from bars etc.), but in the very centre of the city.
Key collection "remote", good contact with the hostess - Beatriz very flexibly arranged the issue of late key collection in the event of a delayed arrival (thank you once again!), efficiently answers questions and messages, stays in touch with guests.
Apartment is well equipped, with good working WiFi (although there was no information on how to log-in, we had to ask). Two bedrooms with a double bed, a large wardrobe with plenty of space and hangers in each. In addition, a foldout corner in the living room. The table seats 4 rather than 6 people. Very comfortable for two couples or parents with 2 children.
Portable air conditioning - unfortunately it is difficult to install the air conditioner pipe in the window. A flat in the basement, poorly accessible to people with reduced mobility (several uncomfortable steps). There is a lack of a dishwasher in the kitchen (it could be useful instead of a washing machine), but generally it is good equipped. It would also be useful to find out where to look for a container for garbage bags (and whether there is recycling). A small, not very comfortable shower (again, poorly accessible for people with limited mobility), but the water pressure was very good, good lighting in the bathroom and a hairdryer. There is also an iron and iron board.
I am pleased to recommend Beatriz apartment for a great stay in Madrid (with the above remarks about the conditions) for shorter and longer stay.