My boyfriend and I stayed at Macarena apartment for 5 nights, and we really enjoyed our stay.
The apartment is located in an area with a real local feeling, + it is 10-15 minutes away from the historic center by foot.
The studio is not very big but was enough for us two. + it is pretty well furnished. Unfortunately we couldn't try the pool.
The only downside: the apartment is at street level on a busy road, so it was a bit noisy.
We would gladly come back for our next visit of Seville.