Clear the room!
Entities can cause several problems, (like draining your 'energy', causing bad dreams, etc) so the best is get rid of it. You can use your mental abilities to visualize a big white ball growing and shining in the middle of the room, turning the whole flat into a bright light.
You can also visualize a 'portal' what sucks the entity into it, then close the portal.
Stay away from wicca solutions, candles and rituals. White candle can work anyway.
Basically the most important rule is not to expose yourself, because if the ghost get aware of that you can feel it, it will glue to you and may follow you to other places.
Use google for good, never hire anybody for work like this and try not to act as crazy so no publick speaking about it
Good Luck!