In a word: wonderful.
The apartment is located 10 min walk from the Cathedral of Seville and close to all important landmarks.
It is very cosy and spacious, has a lot of light and it's well equipped. We traveled in a group of 5 and had more than enough space.
The host, Juan, was really helpful and nice in giving us directions to the apartment so we found it easy and our entire stay was flawless. We will for sure come back here when we get back to Seville.