The biggest problem is that there is not enough space, but this problem is not for everyone. That is why tiny houses are better engineered with more creative use of space. I think for two people it is good decision. Such house is be eco-friendly, it is easier to heat and cool and also you can travel! I recommend to check these projects
http://buildtiny.house/tiny-houses-for- ... chigan-mi/, as for me such model will be quite comfortable:
