Though expensive compared to SEA, I prefer Japan when I need to get away and focus on doing a specific project for a few weeks. I just spent 6 weeks in Japan. For me to focus on anything, I want my environmental needs to be of least resistance and least time consuming of my time. I am typically 2-3 times more productive in Japan but I can't do it more than 4-8 weeks continuously to avoid burn out.

I don't know the language so it provides sufficient isolation. Any talking by others around me becomes part of background noise. It doesn't interrupt my thoughts unlike when I may over hear things in language I can understand.

People are great, respectful and non-interfering. They will leave you alone in most situations. You don't need to keep your guards up regards to scams and watching your stuff.

Infrastructure, facilities and safety are great so I don't need to worry about the environment and environmental changes, just focus on what I need to do. Portable 4G wifi is as fast as my comcast at home, no power or living issues. Food is great and don't need to think and watch where I can safely eat.

When I need a break, the major cities have decent nightlife or places and expat population to provide a break from work.