I visited this WHS in June 2013. Weimar's buildings are a joy to appreciate aestetically and walking around the city was very straightforward even without a map. There are UNESCO sign pointing towards all the different sites and there also is a UNESCO Platz close to Schiller's House!!! Apart from that though, all the buildings that are part of this WHS are within walking distance except for the Belvedere Castle. There is a tourist train that departs from the main city square every hour and it is well worth the effort. Not only is the castle interesting to visit but there are also less people around so at times I had the whole castle to myself! Another treasure trove was the Amalia Library. Unbelievably beautiful if you love libraries, but you have to go early in the morning (around 8-8:30) to make sure you'll buy one of the few tickets sold every day. Allow at least 2 days to visit Weimar otherwise it would be too rushed.