Despite the name, Merchant's Lane is not really a lane but a delightfully warm and atmospheric cafe that provides respite from this touristy side of the city. It's filled with plenty of natural light perfect for photography (and Instagramming), friendly staff, menu is a bit different from the rest and not obscenely overpriced.
Koon Kee is one of the famous places to eat in Petaling Street. I am not a KL local but from what I researched, it's said to serve one of the best wantan mee in the city. That might be true a few decades ago and I wouldn't want to argue with that claim. However, in my opinion, Koon Kee's wantan mee is absolutely horrid and not worth your time and money at all.
Lai Foong Restaurant on Jalan Tun HS Lee is one of the most popular places in KL for beef noodle. For people who are driving they would usually park their cars at Central Market...
Madras Lane is popular for two things - curry laksa and yong tau fu. But there are three noodle stalls in this small hawker centre. Peculiarly enough, all of them have pretty much the same menu and that includes curry laksa. So, which one should you go for?