This is a personal project I did for the 3D Artist magazine where I got to write a 12 Steps about ArchViz in Blender article.
I used the default denoiser at the time, it was not good enough. Today, blender has an awesome denoiser you can use at post-production.
You can find the article in the link below:
I ended up using this project to create an animation using real-time render engine EEVEE. You can find the result here: https://www.artstation.com/artwork/zAeL6D