It's very easy to get around, not speaking Japanese is not a huge barrier for visiting. It's also probably not as expensive as you think. As this discussion sho

It's very easy to get around, not speaking Japanese is not a huge barrier for visiting. It's also probably not as expensive as you think. As this discussion shows, there is a whole range of sizes/prices for apartments, the same is true for transportation, food, events and hotels. For a trip, I'd recommend $150/day/person but a smaller amount is possible with comprimises.