There are several Pay & Display parking bays very close to Silva's restaurant.
These bays are reasonably priced and are free after 6pm and all day on Sundays. Try Holford Road, Hampstead Grove, Upper Terrace or New End (all NW3).
Resident bays are free to visitors after 8pm and all day on Sundays. In all cases please be careful to check any restrictions when you park.