Everything went well during our trip.
Check in and check out (although unorthodox) was hassle free and works well.
A nice little apartment in a good location 15min walk from Atocha Station and 3mins to Lavapies and 5mins to Anton Martin metro stations, 20 mins to Sol.
Bit of noise from neighbours at midnight and 6am. Bathroom and kitchen small but everything very clean. We had plenty of hot water and shower has good pressure. Bed and living area very comfortable.
We would use again.