Very nice and spacious hotel, in beautiful surroundings. The nature surrounding the hotel is gorgeous. The hotel is centrally located in Bad Nauheim, with almost everything within walking distance. The hotel itself has an 'old Europe' vibe.
The breakfast is excellent, and it's a real plus that you can sit outside. The garden is lovely. Hotel service in general is very good. At breakfast, I was checked various times, and asked for my room number repeatedly. This was a tad too much.
Parts of the hotel, including the room I stayed in, as well as some of the hallways, would benefit from some renovating / restyling. Not that it's problematic by any means though. I thoroughly enjoyed my stay in Hotel Dolce and would heartily recommend it.