Oh. @CardowMD there are times when the Universe works in strange and mysterious ways! Last evening, having returned from our most recent cruise, I decided to get out all my cruise notebooks to collate all the different suites/staff members etc into a "little black book" for future reference, so when I read your question this morning, I knew exactly where to find that information! In my little notebook from 2010 (!!) I find the business card from Otanik -which I just put into google maps to check. It appears to still be there 😉 Regent accommodated us at the Ritz Carlton which sounds good but is in the middle of a busy traffic system, so I suspect the Intercontinental could be better. Here's my blog post from that day with more details of the restaurant too
We haven't been to the Archaeological Museum but have been to the Cisterns, which are a must-see (and may be part of the same museum...I'm not sure) Have a great time in Istanbul, one of our favourite cities!