Is Buying a Residence Flat in Beşiktaş a Sensible Investment?

I focus a certain part of my real estate work on residence flats in the Beşiktaş region.
What I observed is that residence sales are not active in the Beşiktaş region.
Residential flat owners prefer to keep their real estate.
However, as I observed, almost all of them are rented out unfurnished.
A certain part of them work with companies that provide an unfurnished rental guarantee.
When I look at the feedback I receive from property owners, a certain percentage of them complain about their tenants' low rent payments and not being able to do anything.
A certain part of them are satisfied with the rental income they receive.
In my opinion, if you are considering buying a residence flat in Beşiktaş for investment purposes, I think furnished rental is the most attractive method of generating income.
In this context, 1+1 or 2+1 would be the best residence flat options.
I don't think the region or project is very important, each region and project has its own demand group.
I don't think the Bosphorus view is of great importance when renting furnished. Because there are tenant profiles with different budgets in the residence flat.
However, when considering the sale of a residence flat, having a Bosphorus view will positively differentiate the sales process and price level.