A single vanity is the right answer far more often than people expect. One basin, one faucet, and the counter space that a second bowl would have taken. In a room under about five feet of wall, that trade is not close.
These run from 24 inches for a powder room up to 48 inches, where a single basin sitting off center leaves a genuinely useful run of counter beside it. Every one is made to order in Italy and can be specified wall hung, which buys back the floor underneath and makes a small room read larger, or floor standing where storage matters more.
Pick the top separately. A flat glass top takes the vessel basin of your choice, an integrated top is one seamless piece with no rim to clean. Both are on every product page along with the exact width, so you can check it against your wall before you order.