Trust us -- after discovering what awaits you at the top of a long flight of stairs, you'll willingly do calf lifts if it means you can stay there forever. Luis's apartment is clean, cool (both in terms of temperature and decor), and has the best view of Sevilla that we could have hoped for. Marble flooring keeps the entire apartment cool -- I am sure this is perfect in summer! -- and paired with white walls, maximizes the light that comes in through the patio door.
The bedroom has no windows to the outside world, making it nice and dark to get a good night's sleep. Rather wake up to views and sounds of the Triana neighborhood? Then pull out the couch -- queen sized, I believe -- and have at it. We spent one night on each sleeping surface and found that we preferred the couch and waking up to views of the Guadalquivir, Catedral de Sevilla, and Torre del Oro. The views from the patio are even more beautiful at night, if that's believable. Despite it being a little chilly and windy, we spent a lot of time out there during siesta and right before bedtime.
Luis was incredibly communicative, accommodating (we were running late for check-in!), and helpful with suggestions for places to eat and things to see. We would absolutely recommend staying here and are already planning our return!
(One quick tip -- the apartment has a water heater/booster that makes a loud click/snap sound whenever you turn on hot water. Don't be alarmed!)