Since it's been awhile since the last report, just wanted to update that I stayed here last week and the lounge was pretty good. Breakfast in the lounge included a few hot dishes each morning (like scrambled eggs, bacon and ham), plus the usual expected cold offerings in Europe (cold cuts, cheeses, yogurt, cereal, salad, smoked fish, etc). Evening service included a variety of small individually plated hors d'oeuvres that rotated, cheese and cold cuts, and a few hot dishes that one could make dinner out of if desired. (For example, one night it was a beef dish, potatoes and pasta). Drinks included sparking, red and white wine, and beers.
No real upgrade given, but I was put on the Executive Lounge floor. The hotel also left a nice welcome amenity with card in the room, consisting of still and sparkling water, and a small dessert.
The hotel had signs up celebrating its 25th anniversary, which for me only emphasized that all the hotel decor must be from 1998 and it's probably past due for a renovation. (The rooms and furniture are all well maintained, however.) AC was only able to cool the room to 23 C, but since I had just arrived from another Marriott family hotel in Germany with broken AC, I was happy to take what I could get!
I did prefer the Marriott's location to the Westin, even though they are only a few blocks away. The Marriott is right across from the train station, which makes arriving and departing very easy if you're traveling by DB, and also basically in the old town.