Two men armed with a hammer and a knife entered the house shortly after 20:00 GMT on Saturday.
A 23-year-old man fled the property unharmed, and another, aged 22, was assaulted with a hammer, but did not require medical treatment.
Another man in his 50s who was in the house was not injured.
A man has been assaulted with a hammer at a house in the Woodvale Avenue area of Belfast.