There are loads of places to stay around or near Tufnell Park but you may have to shop about a bit

Also as Tufnell Park Tube Station is on the Northern Line this is 24 hours so you may want to look at the stops on the line and see if there are affordable accommodation options on one of the stops.

http://www.britinfo.net/index_Tufnell-Park.htm

https://www.trivago.co.uk/

https://www.airbnb.co.uk