Id also like to see more disturbing materials made available. Such as Flesh from the playable races put onto npcs, for clothing/leather armor, helms, cloak, gloves, boots. With appropriate bonuses added. Unsure what would be appropriate for such though. Possibly gotten via pit fights, that require a costly buy in and having to kill random race spawn. For a chance at getting some sort of flesh from them. Even making two levels, one low end weaker one for the drain that gives lesser forms of such items and one for the black market to cater to higher levels.
Also, while the four points are good discussion points the suggestions from others are equally valuable as they are ways to achieve higher traffic and lasting interest in the area you brought up as well as a more level appropriate area for the same chars when they reach the max level for barovian areas.
Raise Dead - Sufficient response given
The Door - Shorten it down to [Opens the peep hole and check who is there], and have it do a quick check, resulting in. [Door Opens], [Peep hole is closed because the guard cant see anyone there] (for people invis knocking), [He roars threw the peep hole, telling the person to flee before he comes out and chops them up for dinner].
Storage Area - I do not really care if there was one, or wasnt. But from the calibans and outsiders mentality im unsure if they would even trust someone with their items or gold. But because we can actually hide gold, or goods behind some bricks away from the main parts of the drain, the bank and storage may be needed.
Merchants - As pointed out he is likely missing for various reasons but because we are having stability issues none have been able to replace. But i think the one merchant is fine as is.