Personally I would not combine mustard and turquoise. Then again in this room it looks great:
Plenty of 'teal sofa' photos on here (https://www.houzz.com/photos/living/query/teal-sofa/nqrwns) but what's your style?
What layout does the new room have? North/south facing? Flooring? Just a lounge or dining too? Many things to consider when choosing a color.
Mustard looks great with teal in small surfaces, be careful with mustard walls. Perhaps a more toned down color, like below, with mustard accents. Same goes for lime accents and pale olive walls.
Or a more dramatic look, with a similar color as the sofa, but darker (and more charcoal to it):
Or something bold:
Or really soothing:
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teal sofa with pale green wall ?
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