As freelancer you don't always need an office and you don't want to meet your clients at home. Some people like to go for a walk and discuss the project but what if it is raining? Here are some places I've had good experiences with the service and space to talk.
1. Central Museum Utrecht's café. Spacious café which is part of the main museum in Utrecht. It' mostly open only during the day.
2. Het Gegeven Paard. Wi-fi and acoustic that allows you to have a conversation.
3. Black bird. Cute place with good coffee and Wi-fi located at the Oudegracht. Somehow it feels more informal and therefore it creates a friendly mood.
4. Het Koffie Boontje. Also at the Oudegracht, across the Rembrandt cinema.
Good luck with your meeting!