Trip to Europe - France, Switzerland and Italy

I would like to do a 6 day trip in Europe as follows:

France - Eiffel tower + winery
Switzerland - Alps (in the background) + snow
Italy - Colosseum, Vatican, Naples pizza, Venice gondola ride

Is this practical for a not-too-stressful family trip with budget limitations? If not, what should be cut out?

Is it true that the cost of "simple but decent" meals daily for a family of 4 would be about RM500/- to RM600/- a day?