The answer to this is really what you want the style to be. If you want it to be low poly then make it low Polly. I would make it more modern but not so realistic with lots of advanced textures. I just feel like low Polly work better in cafes and other games like adopt me and would not work well in a hotel.
Well, actually, you should apply some low-poly as the two other posters have said.
Though, it would be recommendable if you could make a hotel model, that’s not too cartoonish as low-poly because it would seriously ruin it’s appearance as being a hotel. Most hotels I’ve seen in Roblox mostly have almost-realistic appearances, the only thing that differs their models is that of the low-poly plants, normally trees.
Have you tried experimenting with different selections and see which one suits your liking? Mixing cartoony theme and a realistic theme would probably fit but I don’t think it’ll look good since you have too separate themes.
This really depends on your preference if I were to choose I wouldn’t choose either of the themes because it all comes down to you if you’re wanting a more cartoony look that attracts players or a realistic approach something like that just experiment or build one theme and keep it as that.
However, at the end it really comes down on what style your wanting your game to be in. Cartoony game with a bit of - realistic that are both engaging two players, play around with different selections instill you find something you want it would be good to see what style your wanting to make the game as. Don’t take everyone’s word see which one you like and go from there.