Temporary living in Japan in retirement

I'm doing some planning now as I want to go into early retirement in the next few years. I know making a full time move to Japan is off the books, but being Canadian I am allowed up to 90 days stay in Japan. I'm thinking of doing something akin to Canadian Snowbirds in the US where they live in the warmer US states over the winter.

So stay 1-2 months in Japan each year (among other travel plans).

First question is, are there reasonable places to stay, fully furnished, that I can rent for 1-2 months at a time? Not a hotel since it will kill my budget. And how widely available is this in different cities and regions, if there is this option?