What did you eventually decide on doing with the space? Feel free to upload some photos! :)

In the empty space between the cabinets you can have such floating shelves to place books or any display items. You can buy them online o even get them made at any carpentry shop. You could have white to keep the uniformity or blue as a contrast to the white cabinets and matching the blue skirting and table top and the wall too. As a DIY you could instead make a french memo board in a a kickass grey or beige and keep your memos, notes, photos and everything else. Hang your earphones and cables from it, keep your guitar plectrums etc. You will find lots of DIY tutorials for this. This could go well in the space between the cabinets as well and gel with the study area.

You could head to Ikea if you're lucky enough to have one near you. Their Billy bookcases with the added height pieces are wonderful and are available in a black/brown color.

I have a similar issue, i have 3 feet wide & 10 feet long balcony attached to the dining area. It is more like a standing balcony, i plan on adding greenery, and decorate it with some terracotta stuff, pebbles & make it look like an attached conservatory to the dining. My problem is, it is way too narrow a balcony and i want to design it aesthetically. I also plan on adding glass sliding doors and cover the roof top & sides of the balcony with the glass, add some color to the walls to give it a conservatory look. Again, safety is an issue. I need to know if this is feasible and will look good. It is currently under construction. Any ideas & suggestions are welcome!