I stayed at the Erboy for four or five days at the beginning and end of my Turkish vacation. It's not a super luxury hotel but it's clean and comfortable w/very helpful staff (the concierge Tolga was particularly helpful), and is well located w/in walking distance of Hagia Sophia, the basilica cistern, the grand bazaar, etc. It is also right down the block from a huge public park just outside of the Topkaki Palace. If you want to go somewhere further away there is a streetcar station just a block or two away as well. read more