Use the definite article.
The following does not include the Comunicación section.
floor, story; apartment (en España)
first floor
second floor
third floor
ground floor
household chores
living room
armchair
sofa, couch
basement
roof
television set
clothesline
terrace
apartment
garage
elevator
table
chair
refrigerator
to sweep
to rest
to make the bed
to wash/clean the dishes
to wash/clean the floor
to clean
to vacuum
to take out the trash
to dust
in the middle of
on top of
below