I would recommend separate washer and dryer still. Unless you don't mind semi-dry. somehow these two in one machines cant seem to do from wash to dry.
But sorry. I can't help you on the trade-in part.
Can Lorenzo upholster for you again? Leather sofas needs quite a bit of maintaining but should last you for about 8 years. Compare prices. If the cushion is still good then it may be good to upholster again.