Carvalho charges $1 for a small coffee and 57 cents per donut, and does not differentiate between regular and specialty donuts.

Latzanakis, on the other hand, charges 70 cents for most donuts, 99 cents for fancier donuts like eclairs, and $1.10 for a small coffee.

A renovation planned for this fall may help to close the gap between Latzanakis' and Carvalho's stores as far as environment and appearance go.

The newly remodeled Mass. Ave. store will include seating counters, more tables and new floors, as well as a new layout arrangement, according to Latzanakis.

"The whole look will be a lot more customer-oriented and less confusing," he says. "The customer will know immediately where to go for products," as opposed to the current layout, with separate registers for donuts and ice cream.

Latzanakis is quite hopeful that the changes will pay off.

"Sales have increased dramatically in [Dunkin' Donuts] stores with the new layout," he says.

Carvalho says he also plans some minor improvements for his recently renovated store.

The installation of a new air-conditioning system was completed this past weekend.

And then, of course, there's always the Matt Damon factor for the Mass Ave store.

Latzanakis says his store saw a "tremendous increase" in business after the release of Good Will Hunting, which featured his Dunkin' Donuts.

The store will hold a grand reopening in the fall to announce its new look. Latzanakis says he hopes to invite Damon to the event.

He says he intends to save the famous piece of glass from the front window, and if possible to have Damon trace his hand on the glass and autograph it.

New Kid on the Block

While Latzanakis' Dunkin' Donuts has been in the same location for 13 years, just a few years ago a new player entered the Harvard Square coffee scene.