La Grenouille or De Kikker was a well-known music café on the Molenstraat in The Hague. You could go there almost every day for live music and especially many students from the conservatory were very welcome. The property is now for sale as a home. You do have to renovate quite a bit.
The Molenstraat is a side street of the Noordeinde where it is especially cozy in the evenings because of the many (music) cafes.