Going on honeymoon to Greece and Turkey in October. We are spending four nights in Istanbul. Have points to use for the following:

1. Ritz
2. W
3. Park Hyatt
4. Other Marriott or Hyatt

Does anyone know which is the best option? We place a premium on being in walking distance of restaurants and attractions. Based on my research, I believe its best to be in Old Town, but I can't decipher how close any of these are. Many thanks!