Budapest Fleamarkets ?

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Heading to Budapest with daughters in November, they like to have the itinerary set early 🤦 so amongst all the other wonders of the city and perhaps a rail trip to Vienna that we have planed I wonder if any of the membership have any experience of the local fleamarkets?
The 'Ecseri' appears to be one of the better ones ? but as always personal experience is welcome.

My thanks in advance 👍