All you can really give him is time and patience! He still associates you coming into the room as being a negative thing and obviously his previous owners would frighten him in some way. The peeing on the floor is a natural sign of submission and not really associated with whether or not a dog is housebroken. If you see him acting nervously just talk nicely to him and perhaps encourage him to come to you but don't put too much pressure on him or chastise him in anyway for his little accident.
All you can do is show him that you aren't going to hurt him or yell at him. Time will help!
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