In the late 19th century, Brussels was a centre for avant-garde design and architect Victor Horta created a new style, later labelled Art Nouveau. Featuring sensuous curves elaborated in wrought iron, mosaics, stained glass, murals and woodwork. Today, his former house has been transformed into a museum.     Brussels, and Belgium for that matter, has an impressive array of haute cuisine choices – without the Paris prices, as one commented to me.   I stayed at The Dominican in Brussels. A converted Dominican Abbey has found new life as a hotel that is a member of the Design Hotel group. It…