The "not paying" option i am not worried
This is your main worry in this line of work.I have been doing this for the last 20 years in US and 18 yrs in Poland.I only have one residential in Poland that after 3 years of struggling with around 4 tenants I finally rented it to an American friend who is my best payer in Poland for the last 8 years now and also I jack up 100Pln in rent every year.
Also another tip: I only specify one person to be staying in the property.In case another one(like spouse/friend) moves in (without my written consent) is an violation of the lease,and can be used against the renter,if any conflict starts.
Also in reachout Tax no deductions are allowed of any kind.
Some people also dont let the tenant change electric on there name and bill the tenant seperately so incase of conflict they can shut of electric,but that was an old time practice in Poland when umowa was not properly signed.