I’d tackle this in layers, because in a city you usually can’t just wheel everything into a garage. First, choose furniture that disappears easily: folding chairs, nesting tables, stackable stools, and a slim bench with storage underneath. If you already own bulky pieces, invest in fitted, weatherproof covers in a color that matches your wall, fence, or balcony railing—dark charcoal or muted gray tends to look much less conspicuous than a bright tarp. Keep covers tidy with straps or clips so they don’t flap around and draw attention.
For a more permanent fix, use a storage bench or a weather-resistant deck box as both seating and camouflage. You can also create a small “furniture nook” behind a privacy screen, slatted trellis, or a row of tall planters. On balconies, wall-mounted hooks and vertical racks can hold folded chairs out of sight, while a curtain or bamboo blind can soften the view when things are stored. If your building allows it, a custom slatted enclosure around the seating area can hide chairs and a small table without making the space feel closed in.
Finally, edit before you hide. Clear cushions, ashtrays, and small accessories into a lockable storage box, and keep only one or two good-looking pieces on display. A simple outdoor rug and a couple of planters can make the remaining furniture look intentional rather than like clutter. In small urban spaces, the trick is not hiding everything perfectly—it’s making storage part of the design so the courtyard, balcony, or rooftop still feels calm when the furniture is put away.