or,  "Airbnb turned into porn studio!"

Also I’m pretty aware of things to look for when walking through older homes (knob and tube wiring, lead pipes, lead paint, asbestos, foundation issues etc..)

When walking a property, look for warning signs of what needs refreshing (knob & tube wiring still in the place?)

Are they renting it out to porn producers and college party animals?

@Deborah Repaskey Buying a house that is 70 years old is getting better every year, one of the biggest issues with older homes tends to be knob and tube wiring or plumbing that isn't copper, both of these really started to be changed to modern standards starting in the 50s so that decade can sometimes be a mixed bag but those are going to be your primary concern unless someone hasn't replaced a major system like a roof in 70 years. 

After inspections, we negotiated another $10K off for replacing the knob and tube electrical.

After inspections, we negotiated another $10K off for having to replace the knob and tube electrical.

After inspections, we negotiated another $10K off for having to replace the knob and tube.

After inspections, we negotiated another $10K off for having to replace the knob and tube.

If it is just an interior renovation, it is very likely that you can DIY it yourself based on you tube videos.