Here's a typical apartment building in China, with a good cross-section of Chinese people standing in front of it. The buildings are concrete blocks. Most buildings have about 3-5 stories. There is usually a balcony, which is usually glassed-in in North China.
Apartments commonly have one or two bedrooms, a living room, a kitchen, and bathroom.
Floors are usually concrete, although our apartment did have carpet and linoleum. Many Chinese people now are upgrading their apartments with modern kitchens, marble floors, etc., so things are improving. The kitchen in a Chinese apartment is often just a room with a gas burner for a stove and a small sink, similar to what you find in a laundry room in an American home. We had a hot water spigot, but it only worked for brief periods in the morning and evening. I would often be in a mad rush to wash the dishes before the hot water shut off in the morning.