The location is absolutely perfect - across from a historic cathedral in old town, just a few blocks from Calle Caballero where a bunch of restaurants and bars are located. In the plaza below the apartment, there is a wonderful cafe serving fresh coffee and tapas (starting at 8 a.m., which was nice for us). Upon entering, there is an elevator, convenient for luggage since it's on the second floor.
Just 5 minutes away, there is a beautiful park that has amazing bike, jogging and walking paths. They go all the way to the aquarium, science center, and beaches. We rented bikes (they also have baby seats) and rode all day. The bike rental is just a few minutes down the street.
The apartment itself is beautifully decorated by the owner and her son. Very bright, clean and spacious. There are large windows facing the cathedral. Lots of fresh air and beautiful scenery. We cook a lot, so the kitchen was great. It's set up with everything you need, except there were no big knives for chopping vegetables/fruit. The dishwasher was nice since we have a baby and do a lot of dishes.
The listing states there is a dryer, but there isn't. We understand most places in Spain don't have dryers, so we don't expect it (but the listing said there is one, and there's not). We had to go up three more floors (2 by stairs, one walking) to the rooftop of the building, where we hung the clothes to dry. It was very sunny, so they dried quickly, so it wasn't a big deal.
The biggest downside was the bed is extremely uncomfortable. You can feel the springs poking through the mattress. We saw in other reviews people said this as well, yet the owner hasn't taken action to put a mattress topper or new mattress. So that was disappointing. Also, the hot water does work, but runs out very quickly. So be sure to take quick showers!
Overall, great spot to stay in Valencia :)