Okay, take it from me: I've worked in numerous hotels in different cities and I have also stayed in many hotels in different cities. There is no such thing as a hotel that will NOT get bad reviews about cleanliness. Especially on TripAdvisor. As a former hospitality management student, all of my professors as well as employers always told us that people who have a bad experience, even just one tiny bad experience, are six times more likely to pass on the word, including writing on TA or other websites, than they are to if they have a great experience. I stalk T.A. like no other with all the hotels I've worked at, and have stayed at and you will never find a hotel that won't have bad housekeeping reviews. I'm not saying that loews hotels prides themselves on dirty rooms...not at all. You shouldn't be concerned.
Also, the pet rooms are strictly located on the first floor of the second tower.