The apartment is in an amazing location in the heart of Chueca (Madrids gay district). It has all you need although there's basically no daylight and no AC (it is really cool though as there's not much light). Shower and toilet are both next to the bed (toilet in an extra room). The only big problem was that the WiFi was not working although promised by the host and in the listing and there's also no phone service in the apartment so also no internet via phone.
On a good note late check in after midnight was possible and easy.