This place is not a flat, and the fact that it is announced as such is completely misleading. In terms of space, arrangement and services, it is closer to an hotel room; it is actually smaller than most hotel rooms I have been to.
Their concept of "kitchenette" consists only on a microwave and a fridge; the rest of kitchen equipment you would normally find in a flat are located in a shared space. We also found that the pictures displayed here do not correspond to reality: the room we had does not appear in them, and was smaller than the ones that are shown. The room also lacked natural light and had plastic chairs, instead of the ones shown in the pictures, making it a very uncomfortable place to work. If you come here, make sure to bring a sleep mask, as there is a quite bright emergency light in the room, and the curtains do not fully cover the light coming from the outside.
The auto check-in was easy and the communication with the host (which is actually a company) fluid, as long as you happen to speak English, because they do not speak Spanish.
On the plus side, cleaning was good and the location was excellent (Calle Fuencarral). However, there are much better options around for the same price.