Sergio was a really helpful host. When my boyfriend and I arrived in Madrid, he met us at the Lavapies metro station to hand out the keys and to explain some useful things about the apartment. It's an extremely cosy loft, perfect for one or two persons who want to stay for a couple of days. The kitchen and the bathroom were as already visible in the pictures, quite small but unless you don't want to have huge dinner parties, it is perfectly alright.
I'd definitely recommend this!