Miglen was very very nice, we arrived late at night and he even waited for us outside the train station to walk us to the hostel. We heard it's in a not-so-great part of town but we didn't have any trouble, it's actually very safe. We had a 3 bed private and everything was very clean and breakfast was even included. The staff showed us the way around the city and some helpful Greek words!
They have a dog.. and I'm allergic.. but it wasn't terrible. The staff was really nice, they're young and they showed us how to get around very easily. Stayed in a 6-bed dorm, everything was clean and ready, no problems at all.
Right off the Island, very easy to find and everything was really nice and clean. We even got breakfast there and it was delicious!
The hostel was in a good location, the tube station was right across the street. The restroom facilities weren't clean, make sure you bring shower shoes! We stayed in a 15-bed dorm and it was ok value-for-your-money. They will charge you extra for absolutely everything like keeping your luggage if you have to check out during the day but your flight is at night.