Thank you for your tips. With the tree removed, the wall looks very bare. I was thinking of getting a picture or mirror right above the couch but it still leaves quite a bit of bare space between the rest of the wall and the end of the couch... Any suggestions on what I could put there to fill the space?

I have the same situation in a small house and I put my very large desk under the window. It works very well for me. Switch the seating tv area to the front of the room. The sofa can stay as is with a lot of large down filled throw pillows or the sofa that you posted. Delineate the space with a rug as large as possible. Keep the cabinets at the tv and around the seating low (to the back height of the sofa maximum). At the desk area flank the desk on either side with tall billy bookcases with top extensions - as tall as possible. Also add doors to hide the storage items. If you feel you need a physical separation, install sheer white curtains very full, from the ceiling to the floor. It will add privacy and filter in light. This plan will eliminate people from passing your workspace and containing the living space. Here's a plan and some inspiration pics. The line behind the lounge chair is the sheer curtain ceiling to floor. It can be any divider, but not that open shelf you have. The trick with open dual purpose rooms is to keep it simple and hide the clutter while making the spaces functional. You can use the open shelving you have on the right of the chaise (next to the door). TV Wall - Hang a cabinet off the wall to visually create an open space. This pic shows seating at front and work area at window. (I love the light fixture!) Full white sheer curtain panels are one of my favorite design tricks.

I'm guessing that with a woodstove, the heat rises and is recirculated downward by the fan - so it's probably helpful. If you don't care for the look, there are sleeker, modern fans available. The overhead lighting on a fan is usually not pleasant, but it can come in handy when you really need some light - for example, when cleaning.

In order for us to help you, we need to know what his style is. If unknown, have him put in top search box various styles one at a time and have him note what he likes and doesn't like. Traditional, transitional, modern, shabby chic, glam, casual, country, old world, mid century modern, farmhouse, etc. We also need to know the measurements and a floor plan.