Guests who have stayed at 'THE ISO HOTEL, Trademark Collection by Wyndham' reviews reflect that the hotel is generally clean and well-maintained. Both the facilities and the pool have been considered to be very clean. Several guests have mentioned that their room was clean and fresh and they were pleased with their stay. A few guests had encountered some maintenance issues, specifically mold in the shower, rusty stains around the sink and rotting wood in some places on the outside stairways. However, many other guests have highly praised the cleanliness of the hotel, using words such as 'très propre,' 'sauber,' 'wery clean,' and 'me encantó la limpieza.' Some guests have also commented positively on the hotel's grounds, describing them as 'beautiful' and 'clean.' Overall, while some guests have encountered some cleanliness issues, the majority agree that their stay has been enjoyable and clean.