The basic property details are it’s a 1b/1b apartment just outside the Centro of Cascais with a parking garage and access to a community pool.

First, I have true daily and direct access to the 4 owners of Licensing Experts because apparently they don't and won't deal with a bunch of people. 

Quote from @Spencer OBrien: Quote from Srutowski: also, if you could at least send me his current contact info and let me know how he is advertising or how he got a hold of you that would be great.

We don't allow any "deal-making" in the forums, which includes advertising your services or properties, looking for partners, etc.

RTR's advertisements are just that-- ads.

We don't allow advertising or deal making in our Private Message System, so that could be the issue. 

We respond to inquiries, but if someone did the things you suggested to try to track me down instead of following the advertised protocol I would disqualify you as crazy or a potential stalker or just high needs or high maintenance. 

To do Airbnb, you would have to furnish to the nines and add tons of amenities so it is group accessible.

It would enable me to access the equity in my home whenever needed, allowing me to take out a smaller amount, such as enough for a down payment on another home. 

If I sell my stocks to access cash, there's capital gains tax.