We've been to Sensatori Egypt twice.
No upset tummies for us either time. The place is spotless and all of the restaurants have alcohol gel dispensers at the doors, and the staff do ask you to use them if they haven't spotted you using them already. Food is great in all of the restaurants, even the buffet restaurant. My DS particularly grew fond of the 'pancake man' at breakfast who makes fresh pancakes, waffles and omelettes.
The family area with the kiddies pirate ship/mini waterpark is brilliant for little ones - your 3 year old will love it. There's a bar at that pool and at lunch time they do waiter service lunch - Burgers, hot dogs, sandwiches, chips and salads - but naice burgers and hot dogs, not crap ones. The waiters will bring drinks over to your sunbeds too and are always walking around handing out bottles of water, crisps and lolly ices.
We didn't use the kids club but it looked great. There's a mini disco that starts about 7.30pm or maybe 8pm for an hour and again, the little ones all seemed to love it.
If you're looking for stuff to do locally though, there's really nothing much outside of the hotel and you're a taxi ride to the resort centre. We walked along the beach to the next hotel and there's a street of shops and bars that separates the two hotels. There's a chemist on that street and a convenience store amongst other things, and they're a lot cheaper than the hotel if you were to need anything. There's a man on the beach trying to sell camel rides (we didn't have one), we took the camel a piece of fruit every day 
. But we went for a week of total relaxation and good weather, we weren't bothered about going out.
It'll be lovely in late September, just the right temperature.