New light switches, outlets, fixtures, etc to get rid of the dated feel. 

Rehab/repairs consisted of all new floors, tile over basement concrete floor, all new stainless appliances, washer and dryer, full paint job, removing drop ceiling and replacing with drywall, shed demolition, fancy kitchen faucet, granite countertop and backsplash installation (kept cabinets), new bathroom vanity, new gfci and grounded outlets by licensed electrician. 

I would try and "hard wire" each room with coax cable so there is an outlet in each room....then a "main" box on the outside of the house..... then all the installer has to do is attach their cable to the main box with a splitter and then run a  cable from the room outlet to their box and TV etc. ....so the only "new" cable that would ever have to run when service is changed  is from a new satellite to the main box.

This typically includes new kitchen, new bathrooms (but hopefully not the baths/showers), new flooring where needed (typically most flooring), removing the ceiling texture, new windows, décor outlets and switches, paint, typically some doors and handsets (both entry doors and/or closet doors)  and there always seems to be something unexpected. 

. , now have your electrican back to finish up the switches, outlets etc.no go buy your fixtures. check energy code in your area on GPM. install smokes and co2.all done?

it could be some wires became loose at one of the outlets in the series ,or just a bad gfi switch

When rehabbing, I did my best to make it energy efficient by installing smart outlets so I'm able to control the AC/heat units remotely from my phone.

Attend local REIA meetings or try other outlets of networking to find out what marketing works best in your locale.

Replace vanity.10) Replace garage door.11) Replace roof (tear off vs second layer) per square.12) Replace window(s)13) Replace cabinets14) Paint15) Carpet16) Appliances17) New Drywall for an entire bedroom  (or drywall per sheet, roughly)18) Replace outlets and switches (per device)19) Install trim - per linear foot20) Replace/install guttersIf you can get these items above plus probably another handful more that I'm sure I'm leaving out because I'm too lazy to do more, you should be able to come up with a pretty reasonable estimate on most jobs. 

House hacking, at least as far as I understand, is what I'm doing with my multi family; living in one unit and renting the other three out, letting my tenants pay my mortgage, taxes, etc. and still leaving me with a few dollars in my pocket every month.