I discovered Mahmoud Saeed on Tripadvisor.  I was impressed by his prompt reply to my initial contact with him, and his follow through to all of my queries.  We spent a full day visiting Fatimid Cairo, Moeez Street, and many of the most famous Mosques of Cairo.  Mahmoud was the most cordial and professional of guides, and I highly recommend his services.  Originally from the Sinai region, Mahmoud is as comfortable guiding in Cairo, as orchestrating trips to Western Desert, Petra, and beyond.   His company, Egypt Tours Group, is very professional and safe.