I agree that Molly and Tyrone's house still looks old fashioned, which is not very realistic.
Have lived in Lancashire for most of my adult life and most terraced houses are now modernised, in many cases with both front and back rooms knocked through for a more open plan look, and certainly those owned by young couples are usually decorated with a more contemporary feel.
why is the front room never shown or utilised, for though it was true that many years ago the front or 'best' room was generally only ever used for special occasions, nowadays the front room is usually the living room whereas the back room is only used for eating.