Domovoi are friendly house faeries. While most faeries are repulsed by Thresholds, Domovoi are able to thrive in them. However, Domovoi will not do anything to endanger the Threshold of the house it adopted. Indeed, they will help in the limited manner they can, usually with warnings. They have limited oracular abilities, and will provide warnings to protect their wards. They will grieve as much as any family member over the death of anyone in the household.
Though friendly to their Threshold providers, they are less caring toward others, usually stealing to benefit their wards.
Lastly, a Domovoi does not appreciate an unkempt house. Though they can be forgiving in a high intensity household (read: lots of family), they will increase the messiness of an unkempt home if they deem it insufficient. Once returned to proper order, they will be satisfied. They tend to know local faerie cleaning services.
to my background we have similar being, a House brownie, your discretion is more or less spot on to them too.
Another one is an Irish Imp (most of the times getting lumped in with Leprechauns) They are small Fearies that seek human attention by playing jokes and pranks, they try not to cause serious harm to human or animal. They are notable thieves of all things from food to jewelery, thou they can be great friends as long as you can put up with their pranks.
They can be kept in check from this stealing or "trading" as they call it, is to leave a dish on a end table or low bookcase, fill the dish with odd and ends, shiny things and odd coins, one earring or a unknown key.
the most effective way to get rid of one of them imps is simply to ignore it, act as if you don't notice it's joke or they simply don't phase you. sooner or later they will grow bored and find someone else get too.
lol my grandfather used to tell me when i was younger "i must have sat on a little folk back home to gain such in Imp in my bloodline" This was normally after he caught me getting into trouble