I stayed with my wife and 4 other friends for 3 nights while on vacation at Pilar and Rafa's offered house and it was amazing! Not only is the house really great in terms of personality, location, cleanliness, and amenities, but Pilar and Rafas being hosts made a world of a difference. The highlight of our trip was them booking a flamenco show for us that was by far the best of our visit in Sevilla! They were amazing and I highly recommend them for any other group that are looking to stay with them.
PS: Beware that the streets of Sevilla are EXTREMELY narrow so if you're driving go directly to where you intend of parking because you will hardly be able to go through the streets by the house.