My pick
Shimokitazawa, on the Setagaya-Daita side. No other area has as many secondhand shops, and the old train line under the town is now a long car-free strip of paths and gardens. You get the shops, the curry and the walk without the nighttime noise around the station. Shibuya and Shinjuku are both under 10 minutes away.
If you’d rather have calm: Kichijoji. Inokashira Park is the best daily stroller loop in the city, and there’s plenty of vintage within walking distance. The trade-off is a 15–20 minute ride into the centre.
If budget isn’t a concern: Tomigaya / Yoyogi-Hachiman. Yoyogi Park is basically your front yard, it has some of the best small restaurants in Tokyo, and Shimokita is one stop away.