gorenum8938-san,
kon'nichiwa!
We use kotatsu only in winter, but some people might be using only the table part
throughout a year (without kotatsu's futon).
Our life styles have more varieties than 50 years ago, so it really depends on where, what kind of house/flat
we live and also individual's taste and likes. Some people have both Japanese rooms and wooden floor (western style)
and some people prefer sleeping in bed instead of futon.
Hope you can arrenge your house just as you like
Natsuko (奈津子),
Team JapanesePod101.com