Hi,
I've just been on the Tuscany trip and had to fly to Gatwick from Newcastle the day before departure. I stayed at the Premier Inn - North Terminal (make sure you book the North Terminal one though, as there is another Premier Inn close by).
I can't rate this hotel highly enough. I landed at South Terminal, got my suitcase, etc, and got the monorail to the North Terminal which was much easier than I thought it was going to be. Then walked out of the door and there was the Premier Inn - no taxis/buses, just took about 5 minutes to walk there. It's the most conveniently situated hotel I've ever stayed in when I've stayed overnight. I also took advantage of the deals in the restaurant, 2 meals for about £12 odd and had steak and chips for my main, followed by a lovely pudding and a glass of wine. The restaurant is lovely, quite plush, and not all open plan, it's partitioned so you've not too many tables in each section, and the service is brilliant. I didn't get the breakfast deal as I was leaving too early the next day to benefit from it-so I can't comment on that.
Each room is lovely, and has the normal comforts, kettle (with tea/coffee, etc), and was very clean. The card you are given on arrival is used to operate the lift (swipe it over the sensor), to get into your room, and also to get the lights/tv/kettle working.
Overall it's a lovely hotel, reasonably priced, nice helpful staff, and so close to the airport it's unbelieveable. I'd definately stay there again.
Hope this helps.