Cheap PC tables tend to be too small, and ...... cheap. When looking for something for my daughter, I ended up buying the Ikea "Ivar" Shelving system; at 83cm wide, it is enough for a full sized keyboard and mouse mat with room to spare, and the 50cm depth gives her plenty of room to move the keyboard back when she wants to use her racing wheel or graphics tablet (they do a 30cm version as well)
3 different height options for the side panels and shelf mounting points every 2" means you can set the heights to near perfection, plus it is all SOLID wood, no cheap laminates or fibreboard.
best of all, you dont have to buy a specific set, everything is sold individually, so you buy what you need; here is what I started with
https://www.ikea.com/gb/en/products/storage-furniture/shelving-units-systems/ivar-shelving-unit-pine-spr-89006796/
Then I added a lower, half width unit as a printer and PC stand, as she is too small to reach the higher shelf yet (only 5).
Chairs are a different matter, you need to go try them out, as everyone is a slightly different body shape, and what is perfect for some may be really uncomfortable for others.