We were a group of 5 and we stayed at the Glens Centre for one night. We really liked the flat, and we wish we could have stayed for longer! The host is very friendly and accommodating, even though we arrived late at night. The apartment is big, and includes 2 bedrooms, one bathroom, and one kitchen/dining/living room. There was enough space even for a sixth guest.
Tip: Sligo is about 20 minutes away and it is a great place to visit.