If not, a frosted, operable, vinyl window would be preferable to glass block with a small vent opening for reduction of humidity and aesthetics.  

My strong suits are in renovation and interior design and would like to create aesthetics that are unprecedented in the market.

The more savvy investor or better STR marketing investor can make inroads in raising that nightly price point by upping the aesthetic game of the STRs.

They also aren't as aesthetically pleasing as more modern systems and the radiators tend to take up a lot of floor space.

The name of the game is high quality, long lasting, aesthetically pleasing but economical for a rental.Good luck! 

Property just needs some aesthetic work. 3 units. 1 efficient, 1 2b and 1 1b.Rents $475, $375, and $200 = $1050.

Hire good people, treat them with respect, bring them cookies to the jobsite, offer praise when praise is due (contractors are not numbers people as much as they are "aesthetics"...they enjoy being able to do nice work), pay them on time, and you'll have a devoted team in no time.  

Make sure to not go overboard on the cosmetic re-touches, just keep it durable one's that are aesthetic.

Space could be utilized to make the master larger.Any suggestions or changes you all would make in terms of building efficiency, tenant preference, or general aesthetics?

Minor aesthetic updates on the interior of the home, Brand New HVAC and ductwork throughout the entire property.