The old metal pipes are changed to metal -plastic or plastic. They are much more pretty and durable. The next step in the repair is the replacement of windows and doors, if there is such a need after which they begin to decorate walls, ceilings and floor. There can be a lot of decoration options, their choice will depend on your wishes. It is best to choose practical and durable materials, but also do not forget about the appearance, which should be acceptable.