Solo Travel from Portugal

Hello JR Passe team, I would like to get your help/information if possible.

I'm going to travel alone to Japan between 15\11 and 29\11, I'll land in Tokyo and stay for approximately 3\4 days, then I'll go to Kyoto for 3\4 days, I'll go to Hiroshima (just spend 1 day there and come back) and then I'll go to Osaka for the rest of the time until I return to Portugal.

I have some questions:

• I would like to know if it is worth paying for the pass for 14 days.

• To travel 'within' these cities, what is the best option for traveling (I'm planning to visit more distant monuments and I don't want to waste a lot of time walking)

• Is there an App or website that helps guide you within cities? For example, being in a location and easily understanding where to take transport, its routes, timetables, etc.

I think that for now I have no more doubts, thank you in advance if you help me ;) I wish you a good job.

Best regards,
Mariana