What a pleasant area! So pretty!

What a lovely space. You can always change as you go to meet your sewing needs. Looks like you are off to a good start. Enjoy!

I would claim the bedroom as my craft/sewing area, and convert the basement to a guest room. Guests usually only spend time in their room for sleeping and dressing, so lighting is not a big deal. However, if you spend hours sewing or beading, good light and a pleasant room are critical. Go for it!

That is a really pretty set up. I hope it works out perfectly for your needs.

I have two quilting places...one is a spare bedroom on the second floor where all my fabric/tools are stored, and where I cut and piece my quilts (and occasionally FMQ on my domestic) but when I got a midarm, I set it up in the basement (only place it would fit). Unfortunately, it is a partially finished basement in a 115 year old house but I "decorated" with some collectibles, hung a few quilts, and got good lighting in there so it is not so bad. ALso, the space is temperature controlled so it is not too hot, too cold, or too damp.

Second Sewing Area
 

I have a sewing room but set up another area in a spare bedroom that wasn't being used to make purses for the SewPowerful purse project. I love both areas but the smaller room with the Gidget table for making purses has been working out great. Everything is close, I use the old Singer for topstitching. Then if I want to work on a quilt, I go in the other room. I sewed on the kitchen table for years so I am grateful for the space I have now. My bigger room has dark paneling and I'm happy to have it but the lighter space is more fun to sew in.

The dark is a problem. Buy 2 Styrofoam boards 4 x 8, cover with flannel and hinge together. set up in a open V to cover some of the opening to the dark side and curtain the rest. Put some blocks up on youra new display board.

That dark part of the basement is a problem and I totally understand. It would bother me a lot too. Have you thought about buying a standing floor lamp and shining it towards the dark area and just lighting it up somewhat? I used to have a floor lamp that had all these "arms" that made directing the light easier. May help with the darkness, depends on how big that dark is.
Like this
https://www.walmart.com/ip/Your-Zone...-Lamp/21674362

i have sewing in the basement as well....bought a few 4 ft led light strips and no more darkness...you could land planes in there it is so bright

How big is the closet in the spare bedroom? I rented a small 2 bedroom apt. for 6 months. The small 'master' bedroom closet was my office space because I worked from home. A little desk, my laptop, a phone, a nice poster to substitute for a window, all set up next to the open closet door for extra light and to combat claustrophobia worked. The overhead florescent lamp, plus the open door were enough light.

Even so, I could not have used it for a sewing space because of my tendency to spread out my work. It's one thing to type into a computer and quite another to have creative clutter (aka known as a 'mess') all around while you sew!