It is all useful and fun. I find that searching and browsing photos is very useful to get ideas. I have picked up a lot of really good advice from reading discussion threads. I have a few of my own idea books, but I also have bookmarked a number of articles / ideabooks. Weekend morning coffee + Houzz!!

My husband started a tradition after we were married: he made the coffee and brought it into the bedroom so we could enjoy a quick chat before he headed off to work and I got up to ready the kids for school. Now that we're retired, we take turns making the coffee and usually sit to enjoy it in the family room while we check emails or catch up on the news feeds. Life isn't so hectic for us now and I'm so glad we still share the morning coffee tradition.

You could consider custom joinery that actually looks freestanding - purposefully creating a gap from the edge of the fireplace surround to the wardrobe & on the wall side also. This would also mean that it really does not matter if the front of the cupboards do not align with the front of the fireplace. Adding a nicely detailed leg, and a feature handle (you can get some really unique Australian made ones these days) to give some visual interest to the otherwise minimal finishes. Keep it simple & classic so it ages with your child's taste and preferences. As an example, The Design Files recent article has an image of a cupboard in a lounge area, that could be adapted to two double door units on either side of the fireplace https://thedesignfiles.net/2019/10/interiors-house-p-cjh-studio/. Seems perfect for a child of any age, or even if you want to convert the room to a more 'grown up purpose' once they leave home ;-)

We've eaten in the dining room or outside for the past 20 years. When the children were younger, we had the kitchen table angled off the end of a kitchen bench with just enough space for the whole family to eat at it, and we only used the dining room when we had guests. I found that saved a lot of work. I now hate that we have to set the dining room table for just the two of us. I've tried using stools at the servery (and I use those for the grandchildren when they visit) but my husband refuses to sit at the servery, so we plan to renovate the kitchen and re-shape it with a standard-height table on the end of the servery. We are doing away with the existing dining room to make the living room larger, and security-screening a large covered outdoor area to make a combined dining and outdoor kitchen. Since there's only two of us now, we don't see the need for an indoor dining room. If we have guests, we always eat outside. The area is well sheltered and will be partly enclosed. If it's cold, we can set up a folding table next to the kitchen table to extend the indoor eating space. The kitchen table will seat 5 anyway, so it would be rare to want to eat inside and need the extra seating.