We absolutely loved our stay at HARBR. The boutique hotel was just the right amount of trendy for us. Great decor and service. We rented one of the "apartments" that had a large living space with kitchenette and w/c on one floor overlooking the park next door, with stairs heading up to a "loft" area where the bed and main bathroom was located.
The hotel was a bit further out from the old city center than we expected, but that wasn't the hotel's fault, just ours as it was our first visit to Konstanz. It was a 15 minute walk, and a lovely walk at that. There was also a bus line right outside the hotel we could have used for going further distances. Happy that the hotel offered parking (NOT included in the lodging price) with in and out privilages as we had driven our own car to the hotel, and used it to get to some of the sights a bit further away (Mainau Island, Rhinefalls).
The morning breakfast buffet was extensive, and to assure proper distancing you had to sign up for set time. For us that was perfect as we could change the time each day of our stay dependent on our other activities.
We would happily stay at this hotel again.