Vacation Rental in San Francisco?

I was looking for a hotel room in San Francisco yesterday for 4 hours on the web. Offended at the thought of paying $400+ for a boxy, boring room, I migrated to Craig's List. Under vacation rentals are dozens of daily rentals of condos in San Francisco. Some start at $100 per night. This got me thinking. If you could rent a $400,000 1 bedroom condo for $2,000 per month over 20 days, you could break even. Break even is not expected on condos in SF with a normal full time tenant. AND... you could visit your investment property the other 10 days.