I stayed two weeks at Charlie y Edu. In a room with a private bathroom, which was very clean. And I even had a small balcony. The Apartment is only 5 minutes walk to the City centre. Charlie was a very good Host. He was very kind and thoughtful. He provided me with everything I needed. When I arrived he showed me around and explained everything. As I stayed longer than just a couple of days, we also agreed on the room cleaning and I got fresh towels and the bed sheets were changed.
There is also a shared kitchen, which was great. I only used the fridge but you can also cook and sit together at the table.
There is no door bell / intercom. Just agree a time with Charlie and send him a message when you are there.