We stayed at Casa Burguerini for 3 nights and everything was beyond perfect! From the moment I made the reservation from the very last day, the communication was perfect. If you're looking for an apartment with a perfect position: this is it. It's in the heart of the Ciutat Vella and you've literally everything near the apartment (Mercado Central is just around the corner, just like a lot of other shops!)
The self-check-in was really easy (first time for me doing a self-check-in!), and by the way, the stuff was always ready to answer any of our question by messages!
The apartment was really clean and tidy. The kitchen is nice equipped (we made breakfast almost every morning, everything worked perfectly fine!). The little "living room" area was nice and the sofa is pretty comfortable! The bathroom was really clean and tidy. The bedroom has a really big and comfortable bed.
100% sure I'd recommend this apartmenta and, of course, I'd stay here again if I'll come back to Valencia!