This new legislation was drafted so the authorities could keep track on who was living where, with the main purpose to combat terrorism. Foreign holiday home owners, whose kids or mates or aunties want to use an apartment or villa weren't their main target.
Unfortunately, anyone renting out their villa or apartment now come under these new regulations and the bit that (as far as I can see) affects someone simply letting their mate have a free week in Turkey is the fact this could be construed as a rental. I haven't seen anything yet that covers spouses, close relatives etc living in a property, so if the property owner isn't there at the same time, again, this could be construed as a rental - even though no money changes hands.
I don't think anyone really knows how this is going to be policed, especially in tourist areas like Fethiye or Calis. Inspector is probably the man that'll hear something before anyone else as regards how they're doing it locally.
If you have a concern, then you need to get professional advice. I've answered a couple of questions but only because as the regulations stand they were easy to interpret and provide the answer. On the basis you could be fined an awful lot of money, making decisions based on what you read on ANY online forum is never a smart move
JF
