You can walk to the marina in Sharm in a couple of minutes from most hotels. Your dive operator will store your gear securely and deliver it to the boat each morning. Don't be concerned at all about your equipment being stolen...crime in Egypt is very, very low. As to the hotels cleanliness...well, I can only address Camel, but the rooms and all common areas were spotless. I think this would be the norm in an area which relies exclusively on tourism. I understand your concerns, and I applaud you for considering a trip to Egypt. These days, most Americans are afraid to travel to '"exotic" locations. I hope you'll go see for yourself. You will have a wonderful time!
Phil
p.s. to Mania Flight leaves Sunday! Pack your gear!