I don't think anywhere could be said to be living harmoniously with nature, but where comes closest?
Some features I think we'd need to consider:
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Barcelona is probably the best I've seen, there seems to be a decent sense of community and the best mass transit I've seen in Western Europe.
I still wonder whether a city can really be the ideal solarpunk environment for living; I think towns of 20.000-50.000 inhabitants are probably best as you can find all of the amenities of a city while maintaining a connection to the surrounding rural food production.
I think that size often creates a better feeling of community too. Obviously not always; some towns that size are culturally dead - especially when they're spread over low-density suburbia. I think with the right urban design and high population densities that size is perfect though.
I think smaller towns are better for the Solarpunk ideal.
At the moment there is little to do in smaller towns, but that's because the huge cities have sucked everything up!
After we all move back into towns and villages, those towns and villages will thrive in a way that they currently don't.