Me and my boyfriend stayed in the river cabin for a week and it was really really nice. You can hear the water from the river and is very relaxing. Stephen is a great host and he makes an amazing bread for breakfast! Everything in the hostel is so detailed, is decorated in a very creative way and feels so cozy and warm. Also, if you go to Letterfrack don't forget to stop by the little book store/coffee shop called "book at once" the owners are amazing and the place is worth a visit. Same for the arts and crafts little shop on the same road, you'll love it.
Summing up, it was a great experience and I would recommend this hostel to everyone who wants peace, calm and nice people around!