I lived in 500 sq ft with my SO (now husband) and dog for 2 years. I loved it =) We own a house now, and 2 bathrooms is pretty nice, but sometimes I long for the simplicity of that apartment! I could deep clean the whole thing, top to bottom, in less than 2 hours.
Be prepared to embrace your inner minimalism, and sweep/vacuum a lot. The less space you have, the quicker the central areas get dirty!