If you've never stayed in such places, it's probably not very comfortable to use external showers and toilets but in my opinion it worth a bit of an inconvenience to get such a great experience.
Fernando is outstandingly friendly and helpful host, met us at the airport at 1:30am, transferred to the premises, welcomed us with a bottle of pretty good wine and cheese.
Bot itself is not too big at first glance, but there's enough space for two of us - tiny girl and not-so-tiny me.
Overall that's a great place to stay, I'd recommend if you've never experienced anything like that before, you'll not be disappointed!