One of my favourite places in the city centre is Bertmans! It is a Rotterdam institution for the diversity of dishes catering to all dietary requirements including those who do not have any, and the food is scrumptious on all levels. With a casual, laidback sleek interior it is a wonderful place to meet either with friends or professionally. You can meet for any meal of the day, and I suggest you do.
It can get busy which is a testament to its popularity so making a reservation for weekend dinners may be a good idea. For breakfast, you cannot go wrong with their pancakes or brunch platter. Personally, I am a fan of their salads, especially the confit duck and the harissa aubergine and lentil ones are making salads sexy again. Now snacking or borrelen as we say in Dutch is one of the best things here, the General Tso cauliflower, the polenta fries and Padron peppers are amongst my favourites. Desserts whether at the end of a meal or as a meal (life is short, always eat dessert) are fabulous and most noteworthy mostly dietary friendly. Their vegan ice cream is the best I have ever had, and my coffee would simply look lonely without some pistachio shortbread. Their menu changes regularly and seasonally which keeps things interesting. Bertmans is a great place to go for all occasions.