I stayed two nights at this hostel in a 6 bed dorm.
Room: Clean, modern, with lockers.
Kitchen: Our dorm was off the kitchen which was small but equipped. Got very noisy at night.
TV/Breakfast room: Nice place to hang out. Breakfast provided was nice but not great.

I booked a twin room weeks before arriving in Prague and received confirmation of booking. However, we were given a double room when we arrived. The next day, we had to clear the room, bring our luggages down 8 flights of stairs (4th floors) and bring them back up to a triple room. There was no lift in the hostel. I was very angry with the fact that they screwed up my booking. I met other unfortunate travellers who had similar problems. I will not trust this hostel ever again. Worse still, the hostel did not even offer an apology.

Shower was a big headache- we either have an icy cold shower or warm shower with flow as pathetic as one's wee.

The hostel brag about including everything in the price including internet access. However, there were only 3 computers for around 100 guests. You'd be lucky if you get to used any of them!

A few good points about this hostel- about 10 mins walk from tram/train station. Rooms are fairly clean and breakfast was good.

VIBE -
My boyfriend and I recently stayed at the Arpacay Hostel in Prague. The hostel is lovely - set over 2 large, old buildings across the road from eachother. The building we were in is partially residential, so it isn't a 'party hostel' if this is the vibe you're after.

LOCATION -
The hostel is about 5 minutes tram ride from the shopping district Andel and 10 minutes tram ride to the Charles Bridge and Old Town Square. It's a 15 minute tram ride to Prague Castle.

The area itself isn't too bad, however the local train station was dodgy at night and we'd reccomend avoiding it, especially as a female or single traveller. Instead, there is a tram (number 6) that stops literally outside of the hostel and goes to Andel (2 stops). We reccomend taking this tram to Andel, which is a safe and populated area, and switching trams here to any of the tram lines you wish to take. Andel is en-route to the Charles Bridge and Old Town and by switching trams at Andel you'll avoid having to take a tram from the dodgy train station!

CLEANLINESS AND COMFORT -
We stayed in a private room on the top floor which was clean, spacious and comfortable. The bathrooms are clean and there was a bathroom for every 2 or 3 rooms, which had a separate toilet aswell. Towels and linen were provided which was great.

FACILITIES -
There was a communal area to chill out in front of the TV or read on our level. There are also 3 computers with free high-speed Internet connections on them which was great. The hostel also does laundry for you, which is fabulous as it means you don't have to waste time sitting in a laundromat when you could be sightseeing. From memory, it cost about 5 crowns for a load (wash and dry). The rooms also had fans and large open windows which were great for the heat.

The hostel serves a huge breakfast (included in the price) of breads, cereal, juice, meats and cheese which is incredibly filling!

SAFETY -
The reception area is manned from about 7 or 8am - 11pm and the staff are great - very helpful and friendly. There's a fridge with drinks, hot chocolate and snacks available from reception if you need anything.

The hostel itself seemed safe - a set of keys for the building, for the level you're on and for your room. We never felt in danger.

SO..
We'd recommend the hostel. We had a great experience here with no hassles and enjoyed our time in absolutely magnificent Prague!

For £7.50 a night the place was a palace. Vibrant coloured walls, FREE breakfast, free internet, clean rooms, towels and linen provided, good views and very attractive female staff ;o)
The best hostel i've ever stayed in.
Only problem was that our key broke in the door and we slept in the dining room as no overnight staff available. They say the doors are fine, but in Prague every door is 10 inches thick and here the knobs are about 2 millimetres from the frame so you can't twist it.

Moral of the story: Stay here, but use key carefully.