We were in Darmstadt for a symposium that was taking place in "darmstadtium". So the welcome hotel was the logical choice as it is the nearest. (closer and you would sleep inside the conference center). The hotel is a nice, very clean, quite recent four stars.
Service is on par with the expected level of the hotel, breakfast is the full continental offer, from croissants to the whole english breakfast.
There is a bar/restaurant in the hotel but not visiting Darmstadt would be a pity, so use the bar for the welcome and late night beers...
Just one little thing, when the secretary books your trip, make sure the breakfast is included, if you have to pay it separate, you won't have a good start in the day.
