Me and my boyfriend had a nice stay at Javier's and Inma's house. There is a hole floor for the guests, with a nice cosy bedroom , a big bathroom and a living room. We had access to the roof witch is nicely decorated and is amazing when the sun is shining!
We were independent and felt like we were in a flat but Javier and Inma are available if there's anything you need.
It's a 10 minutes walk to the Alameda de Hercules a nice lively place, 20 min to the cathedral if you don't get lost in the charming little streets. Taxis are cheap and there is a station just next to the house so it is easy to get around.