Bellayre Grand is a good choice for a large group of friends/family. Plenty of positives, and a few things to know.
The good... The Margaretville area is wonderful. You're just a few min from town, where there're some great little shops and a well-stocked grocery. Many good restaurants in the area too - just know not all are open 7 days, so check ahead.
Lots of area attractions - hiking trails, streams and lakes for kayaking, fishing or swimming. A great area if you have kids, and I recommend places like Putt Putt Van Winkle (mini golf) and Susans Pleasant Pheasant Farm (kayaking, hiking, picnics). Nearby hiking trails go from easy to hard, so you can find whatever's your speed.
The house has a great layout for a large group: large LR, big DR, lots of deck space. There are lots of separate areas, so you do everything together, or split up into smaller groups for games, movies, chatting, working, etc. The BRs are all good sized, and the bathrooms are very nice. There's a good-sized kitchen with plenty of working and cooking space.
A few things to note... There is a fair amount of road noise, especially from trucks coming down Rt-30. Not a big issue indoors or in the back yard (and not a safety concern), but if you're looking for wilderness quiet this isn't it. Also, the house could use a little handyman TLC - nothing major, but little annoyances.
All in all - we loved our time here, and would come back again. Ages 3 - 63 all had a great time. Enjoy!