if you are on the balcony i would second the auto tracking refractor or similar refractor on an Alt/Az mount. you could also get an erecting diagonal allowing you to look at ground based things from your balcony. with the Dob the kids would need to have an idea of what to look for as they are pushing it to the direction. A 6" is preety small though and will fit - if you get the 6" I suggest you download stellarium - it is a free program - Melb is saved in the locations and it will show you what the sky looks like above you at a particular time and tell you hwere the planets are also.
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