Mortgage with ING?

I'm shopping for mortgages. ING seems to offer the best rate for now. But I've heard there are some hidden costs/conditions (eg need to take insurance) which in the end can make the mortgage more expensive.

In you experience, what are the hidden costs/conditions of ING mortgage? Are there any other banks/brokers with good rates and better conditions?

You need to ask if there are conditions attached (not necesarely the case). If so, usually these comprise: fire insurance, life insurance (so-called solde restant dû), and some times an obligation to have an expensive current account with credit cards.

The loan agreement (with conditions) would say that if you shop around for better fire insurances, then they will revise your interest rate upwards.