Dark wall, with dark wood furniture illuminated with warm lighting does not make the space seem narrow, as one would imagine, rather it makes the whole area appear quite warm and cozy. The black chairs complement the black wall, and the bench is definitely the center of attraction of this open dining space.
Round tables are an important aesthetic option, with some clear advantages. They are more welcoming, versatile, social and less annoying for diners: the legs are less uncomfortable and because there are no corners, we can avoid painful encounters. However, they require a very special space and are not suitable for crowded parties.