Do not forgot quality. Just because you are buying it does not mean you should forget about quality all together. So, if the bed is poorly constructed and the mattress is of low quality do not go for it, even if the price is within your means.
If you have to design a small room, choose furniture that is the right size for it. A room will appear a lot smaller if you place furniture warehouse in it. It’s better to choose pieces that will complement the room without overwhelming it.
Place the furniture in your rooms so that it is still easy for people to walk around. Leave adequate walkways so people can enter and exit the living room without inconveniencing other people who are enjoying the space. You want to avoid making it hard to move around.