I find it complimentary that a person or few liked something about what I wrote and wanted to explore it further. People can be shy or feel a bit intimated posting on a forum, so I don't mind reasonable PM's.
It's a public forum of course, anyone can read from anywhere. Perhaps some don't want to post certain things or write too much personal stuff.
I'm no expert, I just have fun as much as I can. Since I've been to Rome two years in a row (so far) as a solo, sometimes, women (and some men too) may want to get a handle on something I experienced or suggested.
I write of my experiences giving the OP or another some grounding or comparison. I get PM's asking for suggestions about a restaurant, some other things. Some like my ideas and want further suggestions. Then, it's up to the person to take a little from each and go from there.
Most PMer's thank me, but one or two, I don't hear from again. It goes with the territory.
I also get PM's for friendly conversations from others (newbies and regulars.) A few have extended beyond typical forum conversation. Of course you have to build up a trust. If you get a PM that is out of line or deliberately aggressive, just notify the Webmaster.