We booked this apartment for a combination business trip and vacation.
The location was perfect for our conference, which was hosted about 20 minutes away at the Palacio de Congresos de Valencia. For the people going to the beach, it was also convenient: about 40 minutes by tram. And a nice easy walk to the old city and the greenway (where there used to be a river!).
Encarna and her husband were delightful. My partner and I were the first to arrive, and Encarna came to meet us at the airport and drive us to the flat! Even though we spoke basically no Spanish, we were able to get by thanks to Encarna's limited English, charades, and Google Translate :)
The apartment is well-appointed and I don't think the photos do it justice. We were pleasantly surprised when we checked in. All of the towels we needed (also for the beach!) were provided, along with the rest of the essentials (soaps, bedding, etc) and some water, juice, tea, and coffee. They also provided a bag of (bags of) croissants and muffins so we had at least something for breakfast.
We all really enjoyed staying here, but the location is quite noisy during rush hour and car traffic is always audible. If you are a light sleeper, you should probably bring earplugs. This also affects other things like, for example, how nice it is to sit on the balcony in the sun, because you will always hear cars.
The one other (minor) drawback if you're a large group is that this apartment would have been a bit small for 7. I think 6 would be comfortable, and 7 would work if 2-3 of the guests are children, but 7 adults would be crowded because one of the rooms has a pull-out bed for the second mattress, which takes up basically the whole room. Of course, this is still way better than a hostel, but it would be less than ideal for 7 business travellers.
To end on a positive note, though, the dishwasher made cleaning up after our group of 5 nice and easy when we did a homecooked meal on the gas stove, and we were able to do laundry as well. One of the rooms had a desk and the dining table worked well when we had to get work done, too.
I would definitely consider staying here again next time I'm in Valencia, and I recommend you check it out :)