Positives: All of the hotel employees were exceedingly polite, good parking (including a charger for EVs), near downtown (including a supermarket), spacious rooms, comfortable bed, good restaurant.
Negatives: Really slow internet, "refrigerator" is useless, no secondary locking on the doors from the inside, room temperature has limited control, rainfall showerhead was clogged, housekeeping didn't service my room after the first night (a Thursday), many hard surfaces in the hallways mean the noise from other guests echoes, and heavy traffic from adjacent street can't be completely silenced.
I stayed at this hotel while in town for Rally Croatia and it was well positioned for the stages around Karlovac. Unfortunately, it was just too hot in my room, even with the thermostat at minimum, so I didn't sleep any of the three nights. Opening a window just lets in all of the noise from the heavy street traffic.
I tested the internet on a Wednesday at 1500 with the hotel completely empty and got 1.94 Mbps down/1.66 Mbps up. I retested it Thursday at 2200 and got 14.3 Mbps down/12.2 Mbps up, so it appears that surrounding businesses are consuming shared bandwidth.
The refrigerator is actually just a chiller, so nothing actually gets cold. Upside: it's silent.