I would go with a gold or yellow ... of course I happen to love teal/ turquoise and gold/ yellow together. Something in variations on the photos below... maybe some pink accents if you have a girl or lime green or blue accents if you have a boy.

Congratulations on your new home! Now, go cancel that order! Just kidding. Kind of... I really do think, after reading your posts, that you will be happier with the grey couches. Personally, black couches in general seem very bachelor pad (ish). That said, I know there are gorgeous black leather couches available. For a super modern industrial place, maybe. But beach, or that kind of vibe? I am not sure how you would pull that off over the years. Grey or tan (neither are my own favorite decorating colors, but still) would be oh so much better as a neutral for pulling in different color palettes with pillows and art, etc. if you decide to change up through the years... black might make you feel stuck. After reading through what I have written it seems a bit funny, as black is my personal neutral in clothing, jewelry and the like. But as I look around my home there is no black to be seen. Hmmm. In any event, follow your own intuition here, and don't feel like you have to fill the space before your home is even completed. Especially if you are having second thoughts. And remember, this is supposed to be fun for you! When in doubt, leave it out! At least for the time being.

Sorry for the delay....well I still haven't quite got to the floor yet. I have friends and family advising that black would show up every bit of dust etc and one friend who had a shiny black floor and felt that she was forever mopping, and if the light shone on the floor on the wrong angle you could see where the mop had been. I think this would frustrate me too much especially with young children and a cat so I think a whitewash look could be a good option, or reclaimed battered timber perhaps.......see why I haven't chosen the floor yet. Lol. You could always go a black but a weathered matt reclaimed timber that could look good too. Good luck!

Personally , I wouldn't use that wallpaper -- it doesn't suit the apartment style IMO . I assume she wanted to add some focus and colour , but to me it doesn't work . To make it work ( or at least not 'jar' ) if she does insist on the wallpaper , pick out the burgundy or red of the wattle flower ( or whatever it is ) , and do a wall opposite it in that exact same shade , or maybe the kitchen area if you have good masking skills . The animal skin rugs look great , but the couch is 'lost' -- add cushions in the same red or burgundy as the wall , or go even brighter red or burgundy . Rest of the walls can be left as they are ( depending on wall condition ) or any similar neutral ( aka bland ) grey or cream , or possibly even a light steel blue .