Police were called to the address in Ashington in the early hours of this morning, where they found the 20-year-old man with stab wound to the chest.
Three people have since been arrested on suspicion of wounding, and police are appealing for information about the incident.
The man is reported to be a in a critical but stable condition.
More top news
Emma brings you Sunday night's forecast for the North East
"A 4-0 win had to be enough. Sometimes it's a hard life being a football supporter." By Stuart Stratford.
Durham and Cleveland Police are joining a national crackdown on drivers using mobile phones behind the wheel.