Grand Hotel Saint Michel in Paris

So prior to making a reservation I checked the reviews and the actual rooms that they had available. Mind you I did this 6 months in advance, I get to the hotel at night (check the pictures) and found a wet and moist smell in the room, the carpet has lost color everywhere, has stairs that for my mother that is close to 60 years old and 7 year old nephew can be dangerous. The hotel inside the room looks old and the actual bathroom had a lot of areas damaged and the room has stairs mind you none of this is pictured or said on the reservation. I brought my concerns to the concierge due to bringing an 7 year old and the only thing he said was “you paid for that room, no other option I can do” didn’t offer any options or understand the position that we are in. I had to book a hotel on my last night since we couldn’t deal with the room anymore, they never checked up on us or helped us, but when it came time to pay the taxes they had machine ready and no questions. so I payed 2 times the amount for a night for no reason. This shouldn’t be a 4 star hotel,