As two couples, we had a great time in this apartment. The flat is as spacious as it looks in the photos, and felt very modern and clean.
We were greeted by Olga, who was very friendly and more than happy to check us in earlier than the listed time.
The location is great. The balcony overlooks the Botanical Gardens, and it's generally a peaceful area. It's very close to Old Town, which has lots of places to shop, eat, drink etc. It's extremely close to a metro, which has good links to the beach. It's also quite close to several grocery shops (we used Consum). Basically, it's a great base to explore Valencia from.
Only one of the bedrooms had air con, but we won the coin flip, hehe. :)