Our stay there was fine.
The apartment is in the heart of the city, a very nice neighborhood. Juan was very friendly and helpful, gave us a warm welcome, a map and tips. Our check in was very easy and the place very easy to find.
Although the room had no heater and during winter time, that's a big issue. We couldn't renew the air because the room would be impossible to heat after and also when we got wet, it was impossible to dry our clothes.
Another issue was that the bathroom had no window to renew the air and the shower curtain was very short so anytime we'd take a shower, we had to be very careful with the water and the slippery floor.
Lastly the bed is very small; a person at about 185cm can't fit properly to sleep.