I am sorry but I do not speak dutch, but I know many Dutch people read English.
I also have used TopAutoverhuur but I used their free APP.
I found it very useful and I believe the rates were slightly lower than their website.
I found the maps helpful also, as I was not familiar with Amsterdam geography.
Being able to save the confirmation rental car voucher to my iPhone was also very handy.
Regards
Jon
Bezoek Top Autoverhuur Reviews over Top Autoverhuur