The location and the price you pay for this spot is unbeatable! It is located near the main attraction road, Gran Via which means you're near several restaurants, shops, and public transportation.
The apartment itself is quite interesting and seems more like a hostel. It's a 3-4 level apartment with several other residents living in the entire building. If you walk outside to the kitchen and other living areas, you will see other residents. However, this specific bedroom has it's own bathroom and a private key/lock to the bedroom. The room was clean and the bathroom was quite nice (dual showers, double sink). FYI -- there's no central air conditioner (AC), but there's a nice big fan in the room which was just fine. We slept comfortably.
The host doesn't speak much English so make sure you have a translator available on your phone. Also, the apartment doesn't have a buzzer so it was difficult to reach the host when we first arrived. You should try to let him know the exact time you're arriving albeit that can be difficult if no internet connection.
Overall, I'd recommend this place if you just need a place to sleep and shower/change.