This guide, which is printed on heavy stock, showcases hotels, restaurants and shops in Istanbul, sorted by the city's districts, with photographs of each establishment.
Unfortunately, it is sorted by the city's districts, the names of which are somewhat confusing. It does, however, have maps with numbers pinpointing the locations of the establishments.
The photographs are of high quality, so that you get a good idea of what the establishments look like. While the paper is of high, but heavy, quality, the binding on my copy soon split from the book.
I only started using it towards the end of our visit, but wish I had used it sooner.