Many townhouses are only 15’ wide and offer nice layouts.

I “self-manage” (deposit, talk to tenant every 6 months give or take and check in, have Lowes replace the garage door opener and microwave, etc... it may be counter intuitive, but the people who pay the highest rent are often the least demanding)Sorry to get so long winded and ramble, but the explanation is worth as much as the answer sometimes. 

If you choose to go that route lay out a plan that will allow you to offset the taxes as much as possible. 

Look at the finishes of the comps.3) the building has a weird layout and the backside/entrance mates up to an industrial area4) everything in the tree streets is very old.

I don't have a intuitive grasp on all of the costs associated where I can make educated guesses, nor do I have a "worksheet" setup for that.  

I love going to different homes, seeing the vast differences in quality and layout, comparing them to the local market, and putting it all together to make a "big picture".My largest challenge so far is developing an effective marketing system. 

A 2-3 bedroom would be great if the layout would allow for the living room to be converted into a bedroom.

Lay out expectations for the tenant. 

If someone had exactly the same layout as your space, they would work. 

@James Masotti yep absolutely, I get really lost on listing photos as far as layout goes...which is why I love using Matterport.