If you aren't familiar with Baltimore, I would suggest it's a hard no and say that you are trying too hard to make cash flow happen talking Baltimore and tax liens and auctions.

Talk to your eviction attorney.

We're talking trillions of dollars stolen from Americans by 5 of the largest banks.

i think the barrier to entry in what you're talking about is high. 

And people are fast to panic, to turn on others, to talk smack.

I had no idea what they were talking about until I dared ask for more detail.

Though I can also happily talk BJJ, surfing and anything outdoors with a beverage in hand until dawn!

I like using these for just this case.Another item to consider is since this is a 2nd floor I wouldn't be that worried since the 1st floor will heat the 2nd floor enough to not allow frozen pipes.I would also talk to an HVAC person because I believe they can also put a device to cycle the heat a few times a day or even put a secondary thermostat in the apt to take care of the minimum issues.I feel for you because otherwise you have a great tenant.

I highly recommend going to meetups and talking to investors in person. 

Talk to property managers and see if they would manage the other units.