Interesting that it is a converted hospital, my first thought is that it's probably built waaaay better than the typical multifamily which is usually cheap as possible.

Here's an example:  typical 1-fam 3/1 1,200 sq ft house will sell in a B to C area in Queens for $700--800k. 

Some of what I have read said that monthly rentals are typically more, but perhaps that is only for a new tenant, rather than a steady paying good tenant that you know.

I typically buy in B-/C neighborhoods where none of my multi-family rentals have AC.

With a house hack you can use an FHA loan and only have to put down a couple percent I typically hear 3.5%.

When house hunting, unless you want to purchase your own kitchen, look for homes which include a kitchen in the rent price, this is typically displayed as “EBK” or Einbaukuche” There are few expats who move to Germany with their kitchen sink in hand, so ensure your know and expect this before visiting a kitchen-less home.9.

Typically you would start with a complaint filed with the local police and they should be able to help escalate it.Good luck.

I know that investors typically cover those expenses on multi-families, however not sure about SFH. 

I typically buy houses that are in good school districts because in general good school districts have very nice neighborhoods that make the house easy to rent out.

I also build my own kitchen cabinets from scratch, takes about a week of part-time work for face frame kitchen cabinets for a typical kitchen.