The most important spaces for a studio apartment are the living room, kitchen, bathroom, and bedroom. The space of the living room can be used multi-functionally.
You can turn a dining table into a study table and your study lamp into a bedside lamp. Bed with storage will help you a lot to keep the apartment clean and it will also solve your storage problem.
Floating shelves are something that will look beautiful and at the same time it will solve the problem of your storage.
Re-decorate Your Bathroom on a Budget