Should I convert back to original floor plan?

My unit is 656 Sq Ft. corner one bedroom. However the previous owners cut a hole in the wall and installed pocket doors from the living room to enter the bedroom. Then they made the bathroom twice the size with the space. and essentially turned what was a 1 bedroom into their Alcove studio pied a tier. Should i convert this unit back to its original one bedroom floor plan? In other words, the space is now converted to be more like a hotel room or suitable for 1 person to live in, If i converted it back to original layout it would be more suitable for 2 people to live in. What should I do and how much will it cost if I decide to change back.