We stayed 5 nights at the gatehouse. There were positive and negative elements.
Positive elements: nice and convenient location at the entrance of the Connemara national park and very close to Letterfrack's main road, private house (room and bathroom) near the hostel, nice breakfast in the morning with homemade bread, easy communication with Stephen and his wife, cosy living room in the hostel.
Negative elements: although we had a very nice weather almost all the time, and despite the 2 heaters and the heated mattress, the gatehouse was very damp and we couldn't really dry our clothes. Moreover, there are only curtains between the room and the bathroom / toilets, and on the windows of the bathroom, which can be a bit annoying.