The neighbourhood around Cornavin station. Busy, central, slightly chaotic in the way stations always make their surroundings. Most people pass through. A few things are worth stopping for.
The Manor food hall is genuinely excellent — the fishmonger gets fera from the lake, the cheese section is serious, and there's usually something on action worth picking up. En Faim for a good lunch. Mulligan's for a Guinness. Bongo Joe on the Rhône if the weather's right.