We visited a carpet shop on our included excursion in Kusadasi last month. It was interesting, part of their culture. We enjoyed the presentation and the coffee. No hard sell, we didn’t buy a rug. Another shop was scheduled for our included excursion in Istanbul but we all told the guide we had just done it the prior day. No problem, she let us have additional time at the Spice Market.
Fyi, Viking did a great job on our 2 day extension in Istanbul. They kept us busy all day at the Grand Bazaar, Blue Mosque, Hagia Sofia, underground Cistern (very cool), and a lunch cruise in the Bosphorus, before taking us to the hotel. Very pleased.