Have you heard of a place called WFA-Amsterdam in front of World Fashion center in Amsterdam. They are some recently built service apartments. I have got a reasonable quote from them. They do not have a fixed website yet and hence I am little apprehensive.

Thanks,
RP

Here is limited information site for them:

http://www.worldfashionapartments.com/wfa-240.html

The World fashion Centre Amsterdam is quite a way out from the centre, right next to the A10 motorway, which is the ring motorway around Amsterdam, and very, very busy. It is the other side of the motorway from the Vondelpark. Also nearby Osdorp is not an area you want to end up.
I can't comment on the apartments but it's not an area I would choose to stay for visiting Amsterdam.

Just had a look at the site. The apartments look good, however it says minimum rental is 7 days. You aren't staying that long are you? 7 days rental for a flat you only use for a couple of days seems daft to me. Are you thinking of the two bed or three bed apartment? I assume 3 bed with three kids? I can't see a price for a three bed.
As I said in my earlier post though to me it is not an area for tourists to stay, too far out and with a major motorway very close to it.
How long are you in Amsterdam?

@hetismij: I have received a quote from them for 2 days. That is all we are going to stay. Yes the apartment looks good. What are the main sights we can see in 1 and 1/2 days in A'Dam. The main reason I went for A'dam is Tulip fields. Is there any close by Tulip field we can visit? If we stay in Central Amsterdam what are the closest place we can see?
Thanks,
RP

The tulips are not that close to Amsterdam. You have already been told how to get to Keukenhof, which is your best chance of seeing tulips while you are here, as you will be a bit early for fields of tulips I'm afraid.
Amsterdam offers so much more than just tulips. Are you not interested in museums? Enjoying a cosmopolitan and old city?

I still think the apartment is too far out, but at least it is only 8 minutes by train to Schiphol. Get the train to Schiphol and pick up the Keukenhof bus there.

I have to do my research on A'dam to understand it better. Someone told that there is a nice castle very close to A'dam. We might go there. Which Museums are the best there?

If you only have a day and a half and want to go to Keukenhof I'm afraid you do not have time to go to Muiderslot as well, which is in the opposite direction.
I think you really need to decide what it is you want to see in Amsterdam in such a short time. If I had realised you would only be in Amsterdam for that length of time I would have said forget it, add the days to London and Paris.
Search on the forums here for what else there is to do in Amsterdam, have a look on Google - there are plenty of websites about visiting Amsterdam. Decide what you and your children want to see and do.