We really enjoyed the stay at Nacho's apartment. The real positive is the fantastic location very close to the cathedral and close to many place to eat. The apartment was well equipped and importantly the AC was great given the very hot temperatures in Seville!
As other reviews have mentioned, the street can be a little noisy throughout the day but this is very much due to the central location and the bedroom is at the back so very quite.
I would very much recommend a stay here if you are in Seville.