"Bike theft is a fact of life in Amsterdam. Amsterdam Police and the Cyclists' Union estimate that each year between 50.000 and 80.000 bikes are stolen. Mind you: 58 percent of bicycles are stolen from in front of someone's own house, and most bikes thefts take place during the daytime."
Bike Stolen of Missing in Amsterdam? How to Get it Back
We just stayed at a motel with secure bike storage by Schiphol Airport, and took the train to Amsterdam. It was a lot more relaxing than thinking about the bikes. The motel's shuttle took us to and from the airport, where there is a train station on the lower level.