Hi Franco,
Congrats on Silverjet! Luton has nice bits and not so nice bits too. If you are living locally a car is essential. There is a very good train service called the Thamelink which services Luton Parkway Station, and then there is a bus to the airport (not quite sure where you report).
St. Albans is a nice place to live, lots of cafes, bars, shops, etc on this trainline.
Harpenden is quite nice too, although a bit more quite.
Mill Hill is a nice suburb of London, with easy access to Luton Airport, and the City.
West Hampstead is a fab place to live, London on your door step, and the train to Luton.
Remember you will only have to make the journey a max of 4 times a week. The only consideration I would advise would be your standby call out times.
You should be able to find a room to rent for approx £400 pcm.
try
www.spareroom.co.uk
Hope this has helped!