Hey xenos since the sofa is black you can play with a lot of colours. Are u the sort u want spacious bright airy feel or cosy space feel? I notice that the trend is moving towards a low contrast navy blue type of wall colours. It sounds horrible when u try to imagine it but go to ikea and you can see how dark furniture and dark walls work quite harmoniously. They even have Jotun colour codes on the walls in ikea showspaces.

If you want your furniture to stand out then go for contrasting colours.