I have been using Airbnb for years in many different cities around the world and can safely say I have never have I had such a horrific experience in my entire life. I couldn't recommend more avoiding these apartments and the host for that matter.
The original apartment we had booked and payed more money for was not given to our group nor had she given us any prior notice to this. The host claimed this was due to her not wanting us to be walk up and down the stairs make noise between the apartments - but in actual fact, had someone else already living in our booked accommodation.
When we questioned why we were not getting the apartment we book and payed for, the aggression and vulgarity of this woman exploded. Screaming and shouting 'I didn't care' and if we didn't like it 'just leave, just get out and go'. Leaving a young group of women left out on the road with no accommodation or a sense of safety. We later found out that this area in general isn't a safe location to be in, and the fact we were left outside late in the evening was far from ideal.
Unfortunately we are still in the situation of trying to get a refund for the room we never were able to stay in, on top of the extra money we had to pay to find alternative accommodation for that night and weekend. It defiantly affected our whole trip to Valencia for the few short days we were there and unfortunately are still paying for it now.