This is such a lovely, recently renovated place with tons of attention to detail. While is does have two double beds, it’s probably not big enough for two couples or a family with kids - also since only one of the beds has a door / actual bedroom and there’s poor sound proofing; so in short: very little privacy.
I have to agree with the comments about the area: It was really not that pleasant the moment we left the flat. There were often large groups of people with “unclear intentions”, leaving a ton of trash on the streets the next morning, trying to sell us drugs. We (=two men) didn’t feel unsafe per se, but we did often have to skip a street that was “blocked” by such groups and go around. Plus most of the restaurants we wanted to try were closer to the center like Ruzafa. It’s 30 minutes with a bike tops, but you may want to take that into account as well. Enjoy Valencia!