We enjoyed the the atmosphere in which everything was showcased. The museum is much larger than it looks. This is a restored 19th-century Athenian town house (mansion), where modern Greece's first king lived while a more spacious royal palace was being built.
Don't plan on taking your camera in -- it is safe with the coat-check gal. It is best to buy the book (15 euros) in the gift shop prior to entering, although you will recieve a floor plan, but with children, you will not see everything. This museum houses an amazing collection -- it can be overwhelming, so take it in bites. For the price, if you are into museums, make this a two-day affair.
This gift shop is great -- it is actually four rooms with wonderful reproductions of many of the items displayed in the museum. You can buy just about anything: jewlery, pottery, linnens, books, and paperweights, plus a lot more.