There are two distinct parts of Goldor Manor's second floor. The first, reached via the obvious stairs on the first floor, is a long hall ending in a sequence of chests. All but the last contain Golden Swords, which are good for nothing but selling. The last holds Wyvern Claws, which are a nice upgrade for your Black Belt.
The second area, accessible via a secret passage in the northeast room on the first floor, is set up like a small maze. However, if you hug the southern wall, you can walk through two walls to speed your journey to the Crystal Room.
The second area, accessible via a secret passage in the northeast room on the first floor, is set up like a small maze. However, if you hug the southern wall, you can walk through two walls to speed your journey to the Crystal Room.