My friend and I stayed in Cipri's place for a month and 1 week. Awesome and friendly host, very helpful from the very beginning, if you need anything he will provide it for you, also it was very easy to communicate with him trough whatsapp. The apartment is not too big but very nice and comfy, super close to Embajadores and Lavapies, which makes it almost central (it's like 20 mins walking to Sol).
Overall an awesome experience that I would suggest to anyone looking for a nice stay in beautiful Madrid!