You can't curve furniture in Sweet Home 3D. What you can do is simulate a corner like in the image. Straight lines are easy and using the Generate 3D Shape plugin you can create 8-point shapes using coordinates or you can use objects like the triangle, cylinder, and box and combine them into the shape you need. (Check out the Shapes library on dodecagon.nl). Only walls (and thus rooms) can be curved and you can use that to create curved furniture parts.
The only other alternative is to create something with a program like Blender. Looking at your image you can do something similar to my image. That is obviously a work in progress that should result in a Stand Builder library but that won't be released for quite a while.
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