When I worked in Merrimack, I went to the Merrimack DW House of Pizza quite often for lunch (across the street from Ya Mamma's). I also ordered pizza's there quite often for our office staff when we worked late and needed dinner. Both the pizza and the subs are great. They are a pain though when it comes to delivery, which always got under my skin, but maybe they've added delivery with no minimum dollar amount now, I'm not sure. The restaurant is very "no frills" with plastic booths and tacky Greek travel photos on the walls from the 1980s pizza joints, but no one cares about decor when they're in sub/pizza shop. The place is clean, the staff is nice, and the prices are good. They sell my favorite, "Orangina" beverage in their drink case, along with some juices, which is a nice break from sodas. They don't have much on the dessert side - except small packs of Oreo's and those cheap chocolate chip cookies you buy at vending machines. As for snacks, they have chips, but they only offer one brand of plain chips, so there's not variety for snacks, either. However, most people are there to get in and get out and have a quick and easy lunch. I'm sure you'll enjoy the food at the Merrimack House of Pizza - it's not a chain so go and support your local small businesses!