I had a wonderful stay for a week-long trip in Madrid in this apartment, and Magui has been super helpful with all the questions that I have had before and during the trip. The apartment is located on the fifth floor and is quite roomy for a party of two; we had plenty of space to lounge around, and even though we didn't need to use the sofa bed (equipped with pillows/comforters/sheets), the apartment would be great for a larger party as well. The kitchen also had all the necessary kitchen utensils (along with condiments, coffee, and tea) so it was very useful for us to make breakfast in the morning. Everything in the apartment is also very updated and modern since they just added a new mattress, sofa-bed, and microwave.
The apartment is close to everything, so I walked around to all of the attractions and never had to take a taxi or the bus (and if you are taking a short trip out of the city, Atocha station is just a short walk away). If you still need to take the subway, there's a station right outside the door. The apartment is also in a very safe area, and it really is in the middle of everything that the city has to offer (with a Dia supermarket for any necessities on the same street). I would definitely stay here again when I come back to visit Madrid!