Where is LV's lair?

[jakedjensen]

No: HPFGUIDX 87286

In book 5 we are offered several glimpses (via HP) of a strange 
curtained room containing LV.  When Snape and HP are practicing; 
Snape asks HP what "that room" is doing in his head.  Based on this 
statement, we are led to believe that Snape (1) recognizes the room 
and (2) therefore, has been to the room.  All of this begs the 
question, "where is this room and when was Snape there?"

LV's curtained room may be located in Malfoy's manor:

Afterall, something is there:
". . . and if the stories are true, you haven't sold me half of 
what's hidden in your manor . . ." (Mr. Borgin, COS, p. 33)
And everyone thinks Snape visits the Malfoys to collect information 
(see, OoTP, p. 520 & 591) on LV (i.e., it is the only other place we 
have heard Snape visited)


Of course, there are a number of other places it could be:
Somewhere in Hogsmeade (The Shrieking Shack?  Maybe not...)
Somewhere in Nocturn Alley
Somewhere in Diagon Alley
Somewhere in the Forbidden Forest
Somewhere in Little Whining (althought, I doubt it, too obvious)
Somewhere near Privet Drive

Ideas? Thoughts?
Jake