A friend of mine was stranded in the same part of the moscow airport, (en route from Armenia back to the US) but she did not see Snowden, so it may not be so easy to find him.
Perhaps more importantly, none of the many media there have been able to find him so exactly where he is is an open question. Not too many places to hide in an airport.
Presumably a security room operated by the Russian authorities. If something bad were to happen to Snowden it would be a major embarrassment for them, and there are many who might want to cause that.
