I've been at Ren 4/5 times because the food is quite nice but the service is for sure the worst in Hanoi. Last time I've been there they reached the lowest level: 6/7 staffs outside the restaurant completely focused on their phone, another one was at the entrance desk making to himself a fake tattoo with a marker on his arm, 3 waitress at the same time to take the order in my table (we were 2 persons), 6/7 staffs standing on the floor doing nothing but making a lot of noise and playing around, English level of the staffs almost zero, mistakes in taking order, wrong disposition of the dishes on the table, knowledge about what they were serving was zero (I asked about the name of 2 fishes we had in the dish but nobody knew it, so they had to call someone from the kitchen but one of the names she gave us, in Vietnamese, was wrong), and to finish some plastic pieces inside the seaweed salad. Really bad dinner. I liked Ren and I want give them one more chance in the next 1 or 2 months hoping they can improve a little bit.