Level 44: Find mistakes and correct Our house has been redecorated in week. You can still smell paint when you enter and the wallpaper has a striking contrast with the floor.
“Last week” is a time adverb in the past simple, the action happened and ended in the past, do not use the present perfect.
Edit: had been=> was
Our house was redecorated last week. You can still smell the paint when you walk in and the wallpaper is a great contrast to the floor.