In European city plazas, the furniture that works best is usually a mix of the familiar and the flexible. The classic bistro chair and small café table are still everywhere—Paris, Rome, Madrid, Vienna—because they are light, stackable, and easy for cafés to move in and out. You’ll also see folding metal chairs, often in dark green, black, or cream, paired with round tables and parasols.
For public seating, wooden benches with powder-coated steel frames are common, as are all-wood slat benches and simple granite or concrete blocks. In newer or redesigned squares, modular seating is increasingly popular: timber platforms, curved benches, and planter edges that double as seats. Movable chairs are another big trend, especially in squares that host markets and events, because people can arrange them as they like.
Materials tend to be durable and weather-ready: powder-coated steel, aluminum, hardwood, stone, and recycled composite. Designers also use planters, low walls, and steps as informal seating. Overall, European plazas tend to favor furniture that is sturdy but not bulky, easy to maintain, and flexible enough for daily life—café culture, people-watching, events, and quiet breaks. So the short answer is bistro sets, public benches, stone blocks, modular seating, and movable chairs, usually in a mix that fits the square’s character rather than one single style.