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Hogwarts
Snape's classroom is the potions room near Professor McGonnagle's classroom.
Professor McGonagall is in the Transfiguration Classroom (which can be entered in the main hall with the rest of the classrooms).
Professor Potter was created in 1957.
There is no professor with such a name, in the Harry Potter books.
Harry Potter and the Philosopher's Stone.
Professor Snape's "Office" is on the same floor as his classroom - being that they were stated to be next door to each other when Harry Potter and company had a bit of thieving in mind - in the "dungeon" proper of the castle - the "cold dungeon" I believe it was described as that "floor" they are on.
There is not Professor Mergonagor in the Harry Potter series. Professor McGonagall does not die in book 7
It is in the same area as the potions room. It is the door near the earmuff cabinet. You can find her character token in there.
Its Actually Called Harry Potter And The Philosophers Stone silly
No. Professor Quirrell died in Harry Potter and the Philosopher's Stone.
After you finish all years, go back to Hogwarts and find Professor Snape's classroom, go up the stairs and enter the room with the Griffindor sign. Then you finish the transfiguration and blast the metal lock and do the same thing - get the 3 check marks and reserve Professor Mcgonagall.