The restaurant on London's Denmark Street, which opened last year to rave reviews, is run by Australian couple Paul and Tracey Merrony, serves bistro-style food and beat Richard Corrigan's restaurant in Mayfair to receive the accolade.
Giaconda Dining Room was praised for its consistency and reasonable prices, with Time Out's food critic Guy Dimond saying that it has "consistently impressed" the judges of the awards since it opened.
He continued: "It's unpretentious, the French-ish food is consistently good, the mark-ups on the excellent wine list are low, and the prices are very reasonable indeed despite its central London location."
Italian chef Francesco Mazzei's L'Anima picked up the award for Best New Italian Restaurant in this new category, beating Angela Hartnett's Murano in the process, with Bob Bob Ricard picking up the prize for Best New Design.
The winners list is as follows:
69 Colebrooke Row, 69 Colebrooke Row, N1
Best New Café (new category) Lantana, 3 Charlotte Place, W1T
Best New Cheap Eats
Albion at the Boundary Project, 2-4 Boundary St, E2
Best New Design
Bob Bob Ricard, 1 Upper St James St, SW1
Best New Gastropub
Harwood Arms, 27 Walham Grove, SW6
Best New Italian (new category)
L'Anima, 1 Snowden St, EC2A
Best New Local Restaurant
The Exhibition Rooms, 69-71 Westow Hill, SE19
Best New Restaurant
Giaconda Dining Room, 9 Denmark St, WC2
Best Spanish Restaurant in association with Wines from Spain (new category)
Lola Rojo, 78 Northcote Rd, SW11
Best Spanish Wine List in association with Wines from Spain (new category)
Cambio de Tercio, 163 Old Brompton Rd, SW5
By Rosie Birkett
E-mail your comments to Caterer News here.
If you have something to say on this story or anything else join the debate at Table Talk - Caterer's new networking forum. Go to www.caterersearch.com/tabletalk
Looking for a new job? Find your next restaurant job here with Caterersearch.com jobs