The apartment is located in the busiest and most interesting area of Valencia. which is great.
That being said, it is also very noisy until late at night. The noise was not much of an issue for us since it was early spring and we closed the windows at night. This could be an issue in the summer if you do not have earplugs.
There is not enough lighting in the living room, kitchen, and bedroom. It was impossible to read a book at night.
The pull-out couch was very uncomfortable to sit in. I suspect it will also be difficult to sleep there.
The owner put together a great comprehensive book on topics of interest to guests.
The bed was missing pillow covers. We found them the second day we were there. Apparently, the maid forgot to put the covers on the pillows.
We did not need to use the air conditioning. However, the only air conditioner is in the living room, which is the furthest point from the bedroom. It may be very difficult to cool the bedroom in the summertime.