Myself and my partner was in Kotor for 1 week, there are a few good restaurants by the bay but I have to say this was one of our favourites! So much so, we visited twice.
You will find that mostly all restaurants in Kotor offer a similar cuisine of Fish, Meat, Pasta, Pizza and Salad so it is hard to choose a great one.
We found Mondo to have an excellent vegetarian choice, including lasagne and the pizza was delicious!
My partner is not vegetarian and enjoyed some fantastic miniature chicken burgers after becoming a little tired of the pizza/pasta offers.
They also have a good selection of cocktails, I particularly enjoyed a fair few mojitos – but be warned, they are strong!
I would definitely recommend Mondo for a tasty meal by the bay.