This is a nice apartment in a fantastic central location, hosted by a very slick company. The communication and check-in procedure was professional and the information from the friendly concierge was brilliant. The building itself is beautiful, particularly on the inside, and is a special feature in itself. The apartment is sizeable and nicely furnished.
Unfortunately the great central location comes with a massive penalty: the considerable noise from the street and the many nearby restaurants and bars. The building is not well sound-proofed and when you add in very uncomfortable, rock-hard beds, it makes for a long night ... every night.
We were also disappointed in the lack of amenities (no cloths to clean surfaces, no dishwashing liquid, no dish towels and we had to purchase toilet paper) and we found the internet flaky as well - intermittent at times and slow, no matter which of their many routers we tried. Twin single beds is rather annoying for couples too, although clearly stated in the listing.
There is much to like about this apartment and the very good service, but the terrible sleeps we had throughout our stay and the other less serious but niggling issues, mean we would look elsewhere if returning to Seville.