When you have still to prepare work on your computer (in view of your activities in Messe Berlin for example) it is an excellent and quite place. If you have time enough and the weather is nice, you can have a nice walk through Grunewald up to the Messe Berlin. If you are too tired to do that, or if the weather is not attractive to do so, the S-bahn station Grunewald is not 5 minutes walking away, with any connection one stop further at Westkreuz to conquer the whole of Berlin.