Need two specific types near Sheraton Wall Hotel on Buraurd
Does Ramen qualify as noodle soup? You can try Kintaro Ramen on Denman, and its sister ramen place 2 doors away (chicken based stock). But it is a brisk 20 min walk from the Sheraton. You can also try Ezogiku on Robson, same direction, but about 15 min.
Prima Taste's Laksa is a good choice, but again it is a brisk 20 min walk in the opposite direction from Denman.
Ignore the reviews and avoid Legendary Noodles on Denman.
Bin 941 on Davie & Burrard is good and close by.
If you like Izakaya (Japanese Tapas bars), then check my Vancouver Izakaya Crawl posting. Hapa and the 3 Guu Restaurants are good and happening.
Not really any really good pho or even Chinese noodle houses in the Downtown core, though. I would suggest Prima Taste (Malaysian) for Laksa. Perhaps Shanghai Chinese Bistro, Kirin, or Imperial. None of them are true noodle houses, though.
Definitely avoid Hon's - people recommend Hon's to tourists all the time. Chinese food here is just so much better than that.