Courtyard in the castle is probably your best bet for getting the in-castle names. Sometimes a group will set up shop just inside the castle with the 2 gargs and the stairs.
I suppose people don't generally pull from deep within the castle is due to the increasing risk of messy pulls the deeper in the castle you go. In terms of safe rooms within the castle, there should be some behind the hot tub room. I believe there is a room with a torture chamber that is relatively safe as well as some lower rooms that are almost devoid of any mob. Getting to these places may prove difficult, but may be best achieved not from the front of the caste but the tower that you see when you zone in by pond.
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