Some genius designer repurposed a 1900s oak banker's desk as a bathroom vanity. I'll say it again: genius. The desk probably had a rolltop that was either busted or wasn't used. These are some of the heaviest, most solid pieces known to collectors. It's a great example of someone thinking outside the box.
Totally different theme and period could be good... having "period rooms" that can be completely closed from the rest of the apartment could be very interesting (only two such rooms: bedroom and bathroom).