[Lemmo]

If cost is an important factor, don't go to Japan, especially Tokyo. It is brutal at current exchange rates (basically everything costs 50% more in $ than it did 5 years ago). I'm not saying you can't make it work on a budget, but it will suck a lot of the fun out of the trip. For example, even staying in a capsule hotel on the outskirts of the city will cost over $50/night. Anything approaching a normal room will cost much more. You can rent a room in a guesthouse (basically a tiny bedroom in a house sharing bathroom and kitchen) but with cleaning and admin fees even that will set you back close to $1000 for the month (and that is the price if you stay on the outskirts). If you want to live like an adult human, just to have a tiny short-term apartment in a decent area will set you back around $2000/month. Unless you want to either sacrifice a lot of comfort or blow through your cash, I'd suggest a cheaper destination. I love Japan but now is just not the time to visit.