We enjoyed our time in Marga's suite. Although we didn't get a change to meet her, she was very communicative, and her assistant Alicia was very nice, and helpful with our arrival.
The apartment is located above a pedestrian-only street in central Madrid, so it's away from heavy traffic, and yet very close to many sights, squares, and shops.
The place was very well looked after, clean, well-appointed and tastefully decorated. The cute little elevator is a welcome sight to luggage-laden travellers!