Saffy, having stayed in the Jet last summer in the last week of August-first week of September, I'd say AC is essential. They have since installed it in every room, but last year we didn't have it and were tossing about in our sleep. The rooms get very stuffy so without it it was a nightmare, even with our dinky fan.
Apart from that, I'd say the Jet have all you could want, although I'm spending a bit more this year and going for the Sirenis Jabeque mainly because under-occupancy at the moment for the Jet is a joke.