You'd never guess what...?!! Alhumdolillah a response below just an hour ago after 2 years! (though i didnt send him a reminder yesterday to my email to him on 30/9/08)
Wa Alaikum Salam Wa Rahmatullah,
Dear brother, sorry for my late response. Turkiye doesn't use any sort of shock or pre-stunning tools. Our biggest struggle is to make sure hygene in place and shariah compliance (saying Bismillah before slaughter, treating animals right etc.) is followed but shock,pre-stunning tool is not common practice.
I am part of Gimdes Halal Certification Body based in Istanbul. (http://www.gimdes.org - http://www.halalcertificationturkey.com/ firstname.lastname@example.org)
As far as the hotels, I would recommend Golden Horn (http://www.goldenhornhotel.com/eng/) and Grand Cevahir (http://www.grandcevahirhotel.com/) The hotels you listed are European based, secular hotels. If you'd like to enjoy the adhan in the mornings, you definitely want to check Golden Horn, it is very close to Blue Mosque and Topkapi Palace.