Did you like "Song of the Caverns"?
One of the best Thief levels, without a doubt.
Yes, definitely one of the best. My favorite missions are the Sword, Assassins, and Song of the Caverns. Assassins wouldn't be many players' choice, probably, but I like it because it's the most classic thieving mission in the game. No supernatural stuff, no weirdness, just a classic
follow them and case the joint type deal. Also, the mansion is pretty cool. The Sword is obvious because of how weird and unique it is. And Song because of the well designed map, maybe the best in the game. Tbh I'm not that picky when it comes to Thief levels, even the Thieves Guild is ok, to some extent.