Like @Alan Asriants and @Matthew Paul said location, location, location, an area during the day and night are very different things in Philadelphia.While the cashflow might be great, the greater the risk the greater the reward, but there are still plenty of other areas where you can get 200-400/month without being near the largest open air drug market on the east coast.

Issue: Last October 2023, a pipe under the floor leaked from my upper condo unit to the downstairs unit causing damage to the neighbor's kitchen.My condo was paid off, so little did I know, I didn't buy an insurance policy at that time (failed). 

I'd look into Air BnB, VRBO, Furnished Finder, PadSplit, and perhaps even booking.com (I know a lot of STR operators use this, not sure of MTR potential but worth checking out). 

Kudos to her.I do inspections on all of my properties every three months when I go in to change the air filter, check for leaks, and general cleanliness.

I believe that the shower in the second floor bathroom is causing water damage and creating the mold in the first floor bathroom ceiling, which may require removing the first floor bathroom ceiling. 

But I have pictures from before they moved in and plenty of pictures of the mess and damages. 

There were damages and loss of rent.One of the local utility companies verified there was no transfer of service.

Just think about the worst damage a tenant can cause, such being liable for setting your rental house on fire or burning down your rental house and the neighbor's house, etc.

Then deal with the cleaning.In my experience, short-term marijuana smoking hasn't caused any lasting damage.

I don't know what the ratio is, I'm just pulling that number out of thin air.