The apartment is incredibly well styled out. Irene's attention to details with the amenities really made it feel like coming home, rather than being a guest in someone's house. We loved every second of our stay there.
The sliding doors, the honeycomb etching and matching honeycomb mirrors were a very nice touch!
Amenities provided were aplenty - coffee, juice, yoghurt, tea, comfy towels. It was really hard to leave at the end of our stay.
Location wise, it's very close to everything. The Sunday flea market, Plaza Mayor and Opera are all within 15 minutes walking distance. If you're exploring on foot, it's also possible to walk down to the Palace.
This place is highly recommended for anyone wanting to go to Madrid.