We stayed for a month here. The location is awesome, close to the main attractions and in the atmospheric old town of Seville.
The apartment was well equipped, with nice furniture and the hosts were very nice as well.
A couple of downsides: the apartment is quite dark, you pretty much always need the lights on during the day. The window has no views, which I found can take a toll on you on longer stays :D The bed and the rooms are smaller than they seem on the pictures.
So, I would recommend this apartment for shorter stays in Seville.