Great location in the old town, rather than following google maps, make your way to the Casco Viejo metro stop and then start your directions (it will save you about 9 flights of steep stairs). The accommodation still requires a climb of five flights of stairs to reach it.
The room is clean and tidy, with a shared bathroom, very comfy bed. However, there is no lock on the door, so would recommend brining a door stop, but you cannot lock from outside either.
Fernando is very friendly and helpful, we do recommend staying for a couple nights.