Well obviously the sink needs to be Christened, but for normal usage, is the sink or the loo closer to the door? Will you be making yourself work harder to get to the sink in order to pish in it? Just one more thing, sinks pished in regularly DO stink - a mate at uni had a sink in his room which he used for night-time slashes and after a couple of months it smelt like Tramps Alley!
After a posting to HQ AMS I was summoned to a welcome interview with a certain Maj Gen. He asked the usual questions including what my accommodation was like etc. I told him my room was a bit small and old but at least I had a sink. He then nodded sagely and said "Ah, excellent, you have a hot and cold running urinal". If it's good enough for a Maj Gen, it should be good enough for us all.