I started playing HH yesterday, and admittedly I was hesitant at first. It didn't stick out as anything special tbh, I mean there's a lot of harem tagged VN's out there. So what would make it "Special" right?
The first thing that makes it stand out to me is the overall history. You inherit a hotel from a grandfather whom you learn is pretty damn cool actually lol. Also, what I thought would be a simple talk to and screw VN, has turned out to have actual plot & depth being put into each of the hotels residents. Each one has a set of sub-plots that you can discover as you build their affection and other stats. Plus there's the chemistry being put in between some more than others, just like you'd see in a small community.
HH has the potential to effectively be an unlimited open sandbox VN in that the foundation of a world history has actually been put into place already. You are also able to buy things in the game using the currency. It could also effectively be unlimited if the Dev really put some time into it. Right now, you've got a few options, but they've left it open where you could do a lot. Also, you do visit outside of the hotel places, and those could also be turned into fully functioning playable areas if the Dev wished.
This all being said, would I suggest giving it a go? Yeah. I actually would. Be patient, and don't be like me & binge play it lol. You could spend ours in this games world and not actually finish it if you were willing to grind a lot. Otherwise, you do a moderate amount of grinding, but with realistic balance I feel. So for now I give it 4 stars, but I can see giving it 5 if more time and energy is put into developing it as a world setting. Other games could even easily be tied into this one as a base.