I stayed at tulip Inn on a business trip for 3 weeks and after that I had several similar assignments in Mannheim which I stayed in other hotels but I can say that I was never as comfortable as I was in tulip Inn, first of all the kitchenette is awesome if you are planning a long stay and don't have time or energy to go out for dinner every night or you want to make your self some snack.
all of mannheim tram lines also pass from a 5-10 minutes walk from the hotel in paradeplatz and you can find a PLUS supermarket near the hotel for food shopping and the mannheim shopping center within 10-15 min walking.
The breakfast is also very nice specially better than my experience in Italy!
I will ask the company to book tulip inn for me for my next trip!
