ALL exterior walls in the house exposed brick.

[Cameron Hillebrand]

I am considering rehabbing a 100 year old brick house in St. Louis City as a rental. With the quickpoint tuckpointing gun, tuckpointing is very cheap and easy, most likely easier than hanging and finishing drywall. The biggest problems I can think of with exposed brick walls are cleaning the brick walls during turnover and lack of insulation.

Assuming having all exposed brick walls are way way cheaper than drywall, what problems might I encounter with having exposed brick walls?