I am staying in the Hotel Almere which is a new Valk hotel
http://www.hotelalmere.nl/en/rooms. It cost €295 for three nights including breakfast from Saturday. It is not the closest, but it opened in January and I stayed there recently so can recomend it. It is about a 20 minute train journey to Amsterdam and the same to Lleystad. They all speak English which is good as my Dutch is limited.
Last year we had a caravan for a week for €360 which was 3 miles from the showground.