Have removed an unnecessary sliding door wall and will paint the wall (white). The question now is what preparatory work needs to be done on the raw concrete wall, which has been built-in and hidden since the 50s - I don't want to apply a full layer of spackle, so is renovation wallpaper necessary or can I paint directly and get a reasonably even final result? - of course, the concrete nails are now gone and the holes filled with spackle.

On the other side, we will wallpaper with a non-woven wallpaper. Here we have removed unnecessary wooden studs that remained after a folding wall was apparently removed. I will spackle the decimeter-wide gap between the wallpapers - then wallpaper over the existing wallpapers (which are well adhered).

One consideration I have is the corners - should we spackle in joint tape for the repaired corners to achieve better/nicer corners, or be content with the current ones and just paint over?

Should we also add a strip of renovation wallpaper on the ceiling, or is spackling just as good? Thank you in advance for your responses - I look forward to doing this on Saturday 14/1.

Before:
Kitchen interior with a removed sliding door wall. The white wall is visible with hardwood floors and kitchen counters on the right.

After:
Renovation in progress showing a raw, patched concrete wall after a sliding door removal, surrounded by renovation materials and an exposed wooden beam.
Kitchen during renovation, with removed sliding door wall revealing raw concrete. Tools and materials are spread around, and the kitchen is partially tiled.
Interior wall with patched and painted surface showing signs of renovation, alongside tools and construction materials on a workbench.
 
All irregularities come out when you paint. I can't see how rough the wall is but probably very coarse. I would have skim coated the wall when it's so little.
 
Close-up of the wall. Difficult to see - but maybe you can't avoid full-surface plastering/renovation wallpaper?

Close-up of a textured wall, showing uneven surface potentially needing spackling or renovation wallpaper.
 
You can either paint directly, but it surely requires 3 coats and the wall will be rough afterwards. Broad spackling is not as hard as it sounds since the wall is small and will certainly give a fairly good result - cheap and quick. Renovation wallpaper also works - fast and expensive. Plasterboard/spackling probably gives the best result.

On the corners, you apply paper corner protectors that are spackled over. It might not be possible to glue directly on concrete, so if you don't use plasterboard, spackle once to get a smoother surface.
 
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