I was initially hesitant about taking this tour because of the amount of paperwork involved to comply with security measures. This is in fact absolutely necessary and the only way to access the tight security at each synagogue. We were very privileged to attend a morning service at the Ashkenazi synagogue and had our excellent guide Alp to inform us about the history of all three synagogues. We walked a little in the Jewish quarter and then went on to visit a mosque and the spice market. Alp brought his invaluable life experience which really enriched the tour and gave us an experience of local Istanbul life which otherwise we would never have enjoyed.We were impressed enought to book the Bosporous Tour the following day!