i find them pretty safe, but i always use common sense when i book a private for the first time
like google the address they give you and see what type of building it is,
turn up early and see if the outside looks ok, in terms of idiots hanging around, or its a houseo block
call her when you arrive and ask for the apartment number and listen for background voices,
i only do asian women privates, as they tend to be clean and by themselves as they are there to make money for their kids,
not like caucasians that do the job for drug money and there is a risk her junky dealer boyfriend is there too,