Lupi's carries the atmosphere of a time in the not-so-distant past when cell phones were not ubiquitous. While it is contemporary in decor it also feels like a community "3rd place" and not just another place to order food.
Their gluten-free and vegan options allow for some variety, and actually taste decent, though the actual flavor quality varies more than I'd like.
Service is very friendly and has never felt rushed in my memory. My fiancé and I actually ate here before I popped the question, so clearly it's a pleasant atmosphere to us.
I rate Lupi's as the best pizza place for vegan/GF in and around Chattanooga.