We stayed 2 weeks; here's how it went:
PROs:
* great area, very close to restaurants, bars, Valencia Catedral etc.
* close to the park & the metro: only ~30 mins to the beach
* good window isolation
* very good air conditioning, TV, Wifi connection
* kitchen has many utensils
* spacy and airy
* safe area
* property keepers are friendly and understanding
CONs:
* noisy street, garbage is picked at 1AM
* no isolation whatsoever between the bedroom and staircase
* bathroom was clogged when we got there
* had to clean the kitchen utensils before use & the floors (lots of sand & some dirt on them)
* the cleaning products they used had a strong chimic smell, it didn't go away even after our 2 week stay
* bed isn't stable (it's on 4 little wooden legs)
* the wifi is open (no password)
Overall a good experience, but we personally wouldn't stay again next time.