Triclinium vs cenaculum
So, what's the difference between the two?
A triclinium is literally a room with three couches, it was used for dinner parties and the like, a cenaculum is the actual "Dinner Room" which would be used for normal meals. Additionally, cenacula were often rented out as apartments.
The real question is... do weasels tend to prefer one over the other?
Everyone knows a weasel prefers a good dinner party over an informal affair.
What JimKillock wrote sounds good.
"dining-room" is interesting in an English-Latin dictionary from the 19th century.
The Oxford Latin Dictionary (modern) says basically what my first two links do, which are from Lewis and Short's Latin Dictionary (19th century). If you really want to see the OLD entries, I could photograph them for you (typing them out would be too difficult!).