First of all I'd like to say that Barbara and her bf are very polite, friendly and communicative persons. It is easy to highlight any problem to them, for example: it was quite cold at that time (21-22 of Jan) in the apartments, we noticed that to Barbara and agreed on a solution easily.
But at the same time there are some minuses that can stop someone:
1) small children wake up early weekday (at 7 am or so) - our trip almost fully was during weekend and we didn't face with that problem (children just slept :D) and only on Monday we noticed that, but it was ok as we had to wake up earlier for traveling back
2) stairs are very steep. Maybe it is a normal thing in The Netherlands, Idk. But you definitely mustn't drink before taking these stairs :D
Besides that I definitely can say that apartments have a good location: silent, near bus station (with that it's easier and chipper to get to the Amsterdam center), beautiful window view (especially in summer) perfect landlord and price.