I'm sure you know this, but don't forget, whilst you can request a particular building, you have no guarantee you'll get it. If being central is a big deal, you'd need to opt for a Preferred Room to guarantee it. Otherwise, you are entirely reliant on how things pan out with the room allocations. We didn't get either of our requests last time. Wasn't an issue for us, as the our room was an upgrade, and we don't mind walking, but I know lots of people don't like the location we were put in!