I stayed at the Opera Inn for a night before GDC (I was only going for a summit on the Tuesday before) and most hotels were already at GDC high price (i.e. $400 per night). I was super happy to find Jeff's listing at a reasonable price. The breakfast was great, the bed comfy and the room as described. The included internet was quite fast, too, which I appreciated.
On check-in, the hotel charged me $60 for a cleaning fee that wasn't mentioned in Jeff's description. I called him and left a message inquiring and within less than an hour he got back to me and refunded the money. I really appreciated Jeff being so responsive.
The staff was very friendly and the only thing that was kind of spooky was the elevator as it's pretty old.