The accommodation is one room in an apartment with multiple rooms and one shared bathroom. I visited together with my wife for a short city break.
The location is very good right next to the train station. Everything goes there, trains, buses, metro, airport shuttle.
The apartment is very clean and so are the surroundings. In some cities it can be slummy right next to the train station but in Madrid it is not the case.
The building has very thin walls and you will hear everyone even if they are simply talking. We were still able to rest but I could see it being an issue.
The bathroom was very clean but still shared.
The shower is very small and I could barely turn around in it without hitting something. It is also easy too flood (as I did by accident).
Initally I thought it was an issue with the drain but it was actually the shower which has a higher flow than the drain can handle when opened to the maximum.
Overall we had a great time and I can recommend the location if you are ok with what is written above.