The profit was used to buy a higher quality SFH in the same area.

When you charge under market rent, the IRS deems that you do not have a profit motive and, therefore, disallows all rental expenses. 

Take those profits and pay off the rentals.

A tidy, well-organized space can help the appraiser focus on the home's features rather than distractions.Research Comparable Properties: Have a list of comparable properties (comps) that have sold recently in your area.

He knows his stuff and is really good at making IG videos: his brand is a very clever mix of being super humble, telling everyone profits are less than you think and then flashing some fat $$ he made by selling to his investors.

And even if I do not get into the renting business I can make some profit if I decide to sell the property at some point.

If you don't have to own your own residence though, why not invest the money in a profitable investment elsewhere and rent in Japan?

After two years your only profit will be the education you gained. 

And even if I do not get into the renting business I can make some profit if I decide to sell the property at some point.

It outlines profit and losses from rental real estate.