We've stayed at the hostel for four nights during the low season, so it was a little empty. They're well located, near lots of bars and restaurantes, where you can go by walking. The breakfast was amazing, with fruits and fresh bread every day and there are an amazing back yard, with a pool, a bar and a barbecue place. The hostel´s owner, Graziele, is the cutest person ever, She took incredible care of us during our trip!
St. Christopher is an excellent place to be hosted in Paris. I stayed there just for one night, but it was enough to have a lot of fun... The staff is very atencious and animated, the rooms are very good and clean and they have a very good bar/restaurant... The hostel is not that near the city center, but there're 2 metro stations very near the hostel. The only problem is that if you need to let your stuff there after the check out you have to pay for a locker, and it is quite expensive.
Very nice hostel. The staff was very polite and helpful, my room was always clean, the food was very good and the parties so animated! I would recommend this hostel for sure!