We booked this apartment through Airbnb on the very morning of the day we were supposed to travel to Seville. Just a few minutes later, Manuel called on the phone to confirm the booking and assure us the apartment would be ready for us. Four hours after that we were met at the door, not by Manuel but by an employee of the company that rents the apartment (which happens to have an office on the same building, 2nd floor). All very efficient.
The apartment is perfectly located in the city center, at walking distance from most tourist attractions. It's on the 5th floor, everything new and well-equipped. We were four adults and four children. Two of the children slept on the enormous bed-sofa and the rest on very comfortable beds in the three bedrooms. The heating system worked superbly (which is needed, even in Seville, in early January).
Highly recommended.