This isn’t the best way to plan a hair transplant, and it wouldn’t be a great vacation having to take care of It post op.
Always better to plan who will be best for you’re particular needs, and convenience isn’t high on the list, as mentioned above the better choices will be booked up leaving poor clinics/hair mills.
Better to get some consulting done from the better options, but definitely don’t just stick to Turkey/Istanbul.
And yes Dr Nader is definitely a very good choice, he has a growing waiting list, but if you are only NW2 then there’s no rush to do anything right now.
Just my opinion but I would say enjoy you’re vacation and keep researching those Drs/Clinics!