I think against Romero zombies where I live would be fine, there's several rooms on the first floor, and the second floor could easily be sealed off. One thing I need to pick up is a good small radio... that way I could listen to news broadcasts... I think that's a must have for any shelter.
That's a great idea about the radio. We had some pretty severe snowstorms (for the area) this winter that knocked the power lines out for two days and once for almost a week and I didn't have a battery powered radio. If the zombie outbreak would have occurred while I had no communication, I would have been clueless. I got a dual powered radio with weatherband and a few extra setsa of batteries in case something like that happens again.