I didn't enjoy a single night at Purple Nest, but luckily Valencia was so great that it didn't ruin my trip.
Bad things: Our room consistently smelled bad. The a/c was inconsistent so as to be cold one night and sweating the next (once it turned on at 1 am!). Hostel rules don't allow you to bring your own alcohol so we couldn't buy a cheap bottle of wine and hang out in common areas like the other hostels we stayed in. Hostel rules also claim silence after 12am but there were people screaming and yelling on and off all night for the 3 nights we stayed.
Good things: The tour company they use, Tour Me Out, is great! The place was relatively clean and very secure. There was one particularly great woman at reception during the day (didn't get her name) so that was nice. Others were fine but not of great assistance.
Last, I know it's pretty cheap and it's a shared space but the 2 hostels I stayed in during the previous week (Lagos & Sevilla) were less money, offered free breakfast, and were much nicer.
- Free Wifi