English speaking preschools in Amsterdam

Hello,
I am relocating to Amsterdam on 1st week of august. So I am looking for an english speaking preschool for my 2 daughters. Elder one 3.5 yrs and younger one is 2 yrs. I did think about international schools but they are very expensive and cannot afford them. If you are aware of any private school that teaches in english and are also affordable then please share.
While searching on internet i got to know about Bizzy Lizzy and 2 Voices. Does anyone have an idea about these schools?
All your suggestions and advices are welcome. But do share something. I am quite worried about their eduation.
Regards....