I’m away from my computer so I may not be exact. To help with the wall, if it is a separate piece from the rest of the house you can either hide it or uncheck visible in camera. Both are on the properties tab. If it’s all one piece, there is a work around that’s too complicated for me to explain from memory. 

It’s likely a one sided piece  of you go into render settings and click on the preview tab there’s an option for showing or hiding back facing. I don’t remember the exact wording. Set that to show back facing. Then you won’t have hidden walls anymore. 

It’s hard to advise for the render settings when I’m on my phone. Under load presets try one of the higher quality options. Low quality is good for test renders and higher ones are good for final images because they take longer. 

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