Apartment was very cozy and charming, the right size for three or four people. Beds (and couch!) were comfortable, nice dining room table, modern bathroom (although be careful about not getting the floor too wet), and great AC even in the heat of July. Decor was also unique as well.
I saw multiple reviews complaining about noise. Maybe we are heavy sleepers, but I didn't hear much noise at all. The apartment is on a relatively side street, no restaurants or stores in the immediate vicinity, so the only noise really could be from passerby. I will say the sound of people opening and closing the front door of the building is surprisingly loud from the living room, but that's not audible from the bedrooms and it's really not that loud; just surprising. On the other hand, it's nice you don't have to climb a ton of stairs to reach the unit; it's maybe three or four steps up from the main foyer.
The location of the unit was excellent, in a quiet part of Santa Cruz with quick access to plenty of plazas, restaurants, and shops. The Cathedral and Alcázar were maybe 10 minutes away walking.
Juanfran was friendly, meeting me right as I arrived at the apartment, giving me some tips about where to eat and go. We took his recommendation for dinner one night, and it was fantastic.
All in all, this is a wonderful spot in Sevilla. Would definitely recommend it to anyone visiting the city.