Withholding my deposit

Lily's Haven is a *********** when it come to paying your deposit back. Comes up with excuses that the sleeper couch was stained and that the apartment had a smell when we left. The couch was stained and that awful smell was there when we opened the door for the 1st time. Now she doesn't respond to my emails at all in regards to paying my deposit back. I read all the reviews of other occupants before me and it is worse than my review. Just have a look on her ad on booking.com and read the reviews. All i want is just for Lily to return my deposit and i might give her a better review. As for now that is how i feel and I will take measures futher if my deposit is not returned no later than 17/01/2020. I'm not threatening Lily I'm making her a promise because what she is doing is part of ***** and that is a ******** offence the way i see it.