I travelled to Madrid with my two teen daughters and we stayed in this MIT house apartment for three nights. The place was spacious with a double bed and a sofa bed. Our first night we spent trying to figure out how to open the sofa bed where my daughter would be sleeping but It was obviously not working. We tried to contact the host and even the emergency number that they provided on the site but we were not contacted until the next day at 11 am. So basically my daughter ended up having to sleep in an uncomfortable long chair that night. To add to the issues that night, the AC did not work either. It was freezing cold all night. Issues with the AC continued into the second night. There were no blankets and had to work with whatever sheets were there.
The check-in is done all digitally and you never meet the host. If you don't mind an impersonal experience and want a great location this might be your place, but beware if things don't go as smoothly, as communication leaves a lot to be desired and you might end up waiting a while to get an answer back to get help or even be totally ignored after you ask them to please consider your concerns and be gracious enough to get some sort of discount as our first night was not what we had signed up for.
This is a big business with a capital B so If you want a pleasant experience with a human touch this place is not it.