Netherlands- accommodation that I can register as living at

...so we're flying to Amsterdam 1st week of July to exercise my treat rights as a UK citizen with non-EU dependents.
1. problem is there seems to be some law requiring minimum 6 months for renting?

2. we only need 1-2 months to get the paperwork done and then we will be able to decide exactly where we want to live.

3. Have been advised by someone who lives there as follows:
"A hotel will not work-- and when renting a short-term flat, it is very important to ask the landlord if you can register there. This is also a good question to ask for another reason: usually, if the person renting out their apartment says you can't register there, that means they are illegally subletting it"

Any urgent advice please or anyone know any reasonably priced short-term apartments/ houses going?