Me and my girlfriend only stayed in the “river cabin” for one night but wished we could have stayed for many more.
The hostel is beautifully Bohemic with decent facilities considering value for money. The cabin was romantic and situated right next to the river (as the name suggests), with a mini heater and heated blanket inside which is plenty enough for the colder nights. The hostel is also situated right next to a hiking trail up to diamond hill which is a must do (in good weather conditions).
On a side note, anybody visiting letterfrack by public transport needs to be wary of the very limited and inconsistent buses going to and from the area - had to hitchhike out as the only bus left at a different time to what is proposed on the internet and there were no taxis available either.