I agree that location counts, and that it can help to see a place before you take a test there.
However, the first time I took the test I was what could very accurately be described as the perfect location. I took it while I was abroad in England. The location was a private club in London, where all each test taker had a HUGE desk all to themselves (seriously, probably about 6 feet wide, 3.5 feet deep), incredibly comfortable chairs, perfectly balanced air conditioning, very quiet, courteous proctors, etc. Seriously, you could not ask for a better location.
I scored 4 points below my average practice score.
I took the second time, this time at my college after I returned from being abroad. We took it on our largest lecture room, with tiny desks (you know, the half-desks that pull up from next to the chairs), and we were crammed in like sardines.
I scored 7 points higher than my best practice test score.
So don't get lulled into thinking that the location will determine your performance. You may be surprised (pleasantly or not).