Firehouse is definitely my favorite place to go for a hot sub sandwich. They have a lot of different combinations to choose from, or you can create your own. Because they are hot, there is usually a little longer wait than at your typical sub shop. The wait can be really long during lunchtime, but the food is always hot and freshly made. They have low fat options, too, like low cal mayo. The shop on University is always busy, but always clean and has a nice atmosphere. It's also really convenient for those who work in Research Park or on the Arsenal.