Zoar Guest House and Inn is located in a little town of Forfar and it was one of the only places around that we could find good reviews on that was close to the Glamis Castle. The town of Forfar is very lovely. Make sure you try the famous Forfar Bridie - it's a half-moon shaped pastry filled with different fillings - usually ground beef and onions. It's delicious and it's been a Forfar tradition since the mid 19th century.
Zoar Guest House was a gem. We paid about 80 pounds for 2 single beds room, and as you can see by the photos, it was very good value. The beds were super comfortable, the bedding was soft, and it was hard to get out of bed in the morning :) We also had a TV in the room with a selection of DVDs to choose from. The bathroom was very nice and clean as well. One thing to note about the shower in the bathroom is that the water is shut on and off by pulling the little string close to the door that hangs from the ceiling. I made a mistake and pulled on this once when I got into the bathroom thinking that maybe it was a light switch, and then when nothing happened I didn't really think about it after until there was no way to turn on the water later in the shower (and only the shower).
The guest house is connected to the Zoar Inn and Bar, where the breakfast is served in the morning (included in the price of the room). You are served full English breakfast that is cooked fresh (eggs, toast, sausage, haggis, bacon, oatmeal, potatoes, croissants, coffee, etc). We usually didn't need to eat lunch after such big breakfasts.
You can also have a dinner in the bar, since the hotel is not very close to downtown Forfar, although we came by car, so this wasn't an issue. The Inn itself doesn't have parking but you may park on the street in front for no charge.
Overall, this is a very very nice inn and I would recommend it highly to others.