We stayed for 4 nights in September, were a couple of independent travelers with no kids.
We loved the apartment, the building and the general location and out of definitely recommended of you're looking for a great place on Seville.
Pros:
The location is just great and an excellent starting point of you want to get lost in Seville streets
The apartment is renovated and with very modern and cozy design
The building is beautiful
Both private balcony and shared rooftop are great for drinks & relax!
Kitchen is well equipped
So many great restaurants within a few minutes of walk
The bed is very comfortable
Cons:
There's no place to hold the lauggage after check out
Not recommended of you're more then 2 travelers, it'll be very crowded.