Yes—there are quite a few folding options for urban outdoor furniture that you can realistically carry inside. The key is to look for pieces that are lightweight but still weather-resistant, because you want them to handle balcony or patio use without feeling too delicate to move.
Folding bistro sets are probably the most practical choice. A small two-seat set with a folding table and folding chairs can be picked up, carried through a doorway, and stored in a closet or behind a sofa. Look for aluminum frames, powder-coated finishes, and compact folded dimensions. If you live alone or need to move things quickly, a one-person lift weight is important—check the product weight before buying, not just the folded size.
Folding chairs are another easy option. Chairs with carry handles, breathable mesh, or weather-resistant fabric work well for small urban spaces. Nesting side tables and folding tray tables are also useful because they give you a spot for coffee or a plant without taking up permanent floor space. For privacy or shade, pop-up screens and folding privacy panels can be carried inside when not in use.
Before you buy, measure your doorway, elevator, and storage spot. A piece can be “portable” on paper but still awkward if it is too wide when folded. I would prioritize a folding bistro table, two lightweight folding chairs, and one nesting table—that setup gives you a usable outdoor space without turning your apartment into a storage unit.