I really enjoyed my one night at Oasis. The beds were solid wood, so they didn't squeak, making the nights much quieter. The hostel wasn't full the night I was there, so instead of cramming everyone into a few rooms, We had three in a six person room, and for the six person room price! The WiFi was great (carried Skype calls) on the lower floor, though I couldn't get it in my room. Great atmosphere and location! While I couldn't stay for one of the chef prepared meals, it smelled great!
I really enjoyed the porn groove being played in the common room during the day. No... seriously. Reviews seem to be all over the place but my room was great. I stayed in one of the four bed rooms with the attached shower and sink. Overall, very clean, well maintained (except the stair wells) and a good atmosphere. The WiFi was iffy but it worked for email and Facebook, if not for Skype and YouTube. Common room was small but lively.
No atmosphere but very comfortable. This was my first hostel experience. The location is in a building near the Meuse, right near the old city and many of the sights as well as the city park. It was a manageable walk from the train station. I visited in February and the place was mostly empty. The WiFi was great and the lockers in the basement made storing stuff after checkout very easy. I didn't have a whole lot of interaction with the staff, but most of these interactions were positive.