I am not a GC myself, but if you are wanting to learn more about rehab costs, you should walk properties with different GC's. 

I asked a dozen times for someone to just walk me through 1 deal from start to close for a $15k product you would assume that a couple hours of one-on-one time would be included but it's not.

Bigger Pockets has a ton of resources on the process side of things to walk you through getting the unit ready, all the way into managing the property.

I purchase multifamily all the time and when I walk properties, I always inquire with the tenants to gain an understanding of the property.

If everything is fine on the legal / rental side of things I would stipulate in the lease that the large living room closet would not be allowed to be used as a bedroom and would need to be utilized in some other capacity i.e walk in closet.I understand no one can give legal advice on this site but guidance or websites to look over would be a huge help! 

. $200 monthly flat fee and they walked away after we did the work and after 1 month.

If so would you walk around in that area after 8 pm ?   

But start back and zero if you want for me so I can walk you to your goal...Lastly, price sensitivity hints at low problem solving, scarcity mindset, time value not worth much to yourself (well at least now), so that paradigm will have to shift if you are to become an investment juggernaut.  

I'm very active—I ride my bike, walk to the beach about 3-4 days a week, and can walk to most of my workout classes.

Make sure to get lease info and walk the units before doing anything crazy.