After three days on a boat, we arrived at the hotel to find out that they didn't have our reservation (which we had booked some 5 days earlier). The staff were incredibly rude and unhelpful - in fact, they simply refused to believe we had a booking at the hotel, despite us showing them our online reservation confirmation. Then when we asked if they had rooms available, they tried to charge us the much, much, much higher 'walk-in' rate for rooms.
When we asked to speak to the manager, they told us he was not on the premises. When we asked for them to call Expedia to confirm our booking, they refused. Even when we pointed out that they advertise their hotel and receive bookings through Expedia, they still refused to take any responsibility for the situation (saying it was our travel agency and we should contact them - despite us not having a phone).
In the end, we had to email Expedia and have them resend the confirmation - this took two hours during which time we had to wait in the lobby. After three days on a boat, we were livid at how rude they were to us.
As we found out, the problem was that the room had not been charged yet (only booked) in their system. The staff were much nicer when the confirmation came through, however, when we paid, they applied an astronomical exchange rate which grossly inflated the price... But by this time it was too late at night for us to find another hotel so we just had to pay it.
Having had similar problems with hotels in Brazil in the past, we were horrified at the poor level of service. The staff at Taj Mahal were so rude, it was obvious that they were just hoping we would go away and they wouldn't have to deal with it. Other hotels, have in the past checked whether any rooms are available, taken a pre-authorisation of my credit card, and taken us straight to the rooms. (Then sorted out the booking later).
As for the actual hotel, it was probably quite nice 30 odd years ago, but has not been updated or improved since. For Manaus, it is by no means the worst hotel going around (though certainly, it is the most overpriced).
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC