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Regardless of industry, some companies have services for helping you find an apartment, others will have apartments specifically for relocation purposes. Specific to IT, I've never heard a company offering the same things. Some will fly you out. Finding an apartment isn't too difficult although you can only look at the "foreigner list" of apartments.

Regarding tax, it doesn't change. There aren't any breaks nor special levees for foreigners/people with just a work-visa. You get taxed the same (you can even participate in ふるさと納税 [furusato-nōzei] which is a system where you can decide to pay a certain amount to a different prefecture for tax deductions the following year + a gift from the prefecture that you can pick. The gifts are the best part; you can get high grade Japanese beef, high quality fruits, etc).