Easy responsive communictation, super easy check-in, very stylish and comfortable inside. The TV came with Netflix, which was a pleasant surprise. All the little bars and restaurants on the surrounding streets were also a nice little bonus. There's two very small supermarkets within a block of the apartment, and of course, it's just minutes from Atocha, which is the main reason I booked.
Some things to note: there is no elevator, though the stairs are nice and wide. The building is old, and despite being modern, clean and nicely furnished, it still smells like a musty old building when you walk in the rooms. Lastly, the whole building is pretty much leased out as guest apartments, so there will be lots of people coming in and out, and possibly making a fair amount of noise, which given the thin walls and windows, you can hear quite easily in the apartment.
With that said, the place was as advertised (slightly better than I expected even), and I would def. come back.