I've been coming to Mashawi for almost two years and I've yet to be disappointed. If I'm looking for a big lunch on Green it's my go-to restaurant.
The only downside is that it can be a bit pricy depending on what you get. Sandwiches and falafel are pretty cheap, but shawarma with hummus can be $9.00+.
Overall, though, the food is really satisfying and the people who run it are really nice. Always a pleasure to eat there