Buildings 14,18,35,38 and 64 all have studios on the third floor. All other buildings have studios on the first and second floor. Studios are found on the far ends of each building.
Here is a <a href="http://disboards.com/showthread.php?s=&postid=1251562#post1251562">building configuration for OKW.</a>
If you aren't used to climbing stairs, the third floor may be a little tiring after a long day. As already noted, the Bell Staff is available to assist with luggage.
Building 64 does have an elevator (along with 62 and 63).
Enjoy!