Can’t help you with the Viking verbiage, but I’d agree with Azulann and presume you will get an actual tour of the Blue Mosque. We did a DIY trip to Istanbul many moons ago (decades, actually) and did not buy carpets because too intimidated by the rug dealers in the bazaar. On another DIY trip in Morocco a few years before, however, we went to a government-run/regulated rug demonstration where they gave us fair prices and we didn’t have to haggle. Bought three rugs which adorn our floors to this day—nearly 40 years later! So if it were me and I was interested in getting a “Turkey” carpet, I’d check it out. Personally not into the very high-pressured sales tactics in the bazaars!