For Rendering we used Royal Render as a Render Wrangler. Rendering tiles wasn't so Easy for the Wrangler in the Beginning because release 6 was very new and because of that still had some troubles concerning the special Conditions. But with a short and direct connection to the Support. Royal Render soon could handle all the difficulties in the new Bugfix versions. According to that i don't want to imagine how the job would have ended if we didn't had that direct connection to the developement Department.
The Most challenging issue for the Rendering was, that the production company wantet every piece of Furniture laying on a separate Layer with separate Passes and ObjectID's. So for one Scene finally it had 40 Render Layers with about 5-10 render Passes producing for one Picture more than 200 Layers. Every Scene again had up to 20 different Camera Positions.
Especially for the logistic part Royal Render did a perfect job. Thinking of handling all these Parts with another Renderwrangler (i tested much yet in my Artist carrer: rush, smedge, deadline, backburner) but non of the compeeding Products would have handled this issue so user friendly and intuitively. I so far have no problem plugging Royal Render. Because it really helped in the workflow fundamentally.
The bigger obstacle was Mental Ray which took sometimes unreasonable long rendertimes and often was very unreliable concerning the final result. Maybe it had just too much to struggle with the textures which where mostly pretty huge (mostly 4K).

I mostly Finalized the Render Scenes which were originally created by Eckbert Reichel. After my Finalizing of the renderings, Kathrin Jula Müller took the Layers and Composited them to the final multi layered Photoshop file which were then uploaded to the Production Company.