It was absolutely a delight to stay at this place.
Check-in is a breeze and very fast, and the meet and greet timely and simple. The apartment is clean and has everything you would require for a stay in Madrid. The beds seem new and very comfortable, as well as the pillows and bed linens. The air-conditioned is whisper quiet and cooles the place down in no time. Everything you need for cooking is available in the little well-equipped kitchen and the fridge is bigger than you find in most apartments. Washing your clothes is super convenient too and thanks to the dry Madrid air, you only need to leave them outside for an hour or less to be completely dry. The bathroom and shower are like new. The water pressure is great and the drains work perfectly. More than you can say about most places I have been in.
The location is one and a half blocks away from the main street Bravo Murillo. It may not be a super fancy street, but I enjoy these kinds of neighborhoods with ethnic diversity. The streets are completely safe to walk at all times and I never felt bothered at any time. With only a few minutes of walking, you will find bus stops and Metro stations to take you anywhere you'd want. Bravo Murillo is lined with shops and great little restaurants and bars, many of them still in the old and original Madrid styles. Best of all is Mercado de las Maravillas, an old fashion market where you walk around stands with fish, produce, and meat. Here you will also find small bars and restaurants. Definitely worth the experience. Within a few minutes of walking, you will also have regular supermarkets like Lidl, Carrefour Aldi, etc. Most closes at 10 pm but some are open 24/7. Should your desire to pay more for your merchandise there's always El Corte Ingles just another 10 minutes walking east from Plaza Cuatro Caminos.
I hope you find this information useful.