I went to Japan last year and speak rudimentary japanese. One big challenge for taxi use was always explaining where I needed to go. If I could have plugged in the address in an app, I would have saved myself some confusion. That said, the Tokyo taxi drivers know the city better than any driver I've ever seen ever. GPS is almost a complete waste on them.
0. Japanese business cards often have beautiful design.
1. They are a good way to remember the cool places you visit.
2. They often have a map on the back that show you how to walk there from the nearest train station(s).
3. They have the address on the front, which you can show your taxi driver--no verbal communication necessary! (besides the obligatory onegaishimasu)