First let's deal with the noise issue. Many of the older reviews mention train whistles. This is no longer an issue (a law was passed in 2010 prohibiting trains passing through Flagstaff from using their whistles). So you're not going to hear any trains (even though the Amtrak station is just down the street).
On the other hand, there are 2 bars in the hotel that feature live music. This you are going to hear (at night), no matter which room you're in. The type of music and how late the band plays depends on the night. I stayed on a Monday night and a blues band played in the main floor bar until midnight. I also stayed on a Thursday night and a jazz band played on the 3rd floor bar until 9pm (the latter was rather pleasant in fact, and I'm not even into jazz).
To be fair, when you reserve a room the staff almost try to talk you out of staying because of the live music, so it shouldn't come as a surprise to anyone (and wasn't to me).
Live music aside, I would definitely recommend this hotel. The staff are very friendly and helpful (even offering me the use of their cell phone to make a local call) and the location can't be beat. Right downtown within easy walking distance of the Amtrak station.
As previously mentioned I stayed on 2 separate nights (a Mon and a Thu), both times in room #57. This is one of the rooms that shares a shower/bathroom. Both are right across the hall and if anyone else was using them during my stay(s) I was none the wiser. Everything was clean and well maintained. The room was more than adequate for my needs (I was travelling solo) and well stocked (towels, soap, shampoo, plastic cups, ice bucket).
Two minor complaints: You can't tell if the shared bathroom is in use so I took to knocking gently on the door before using my key. Also, the stopper for the sink in my room was missing. I asked the staff if they had a spare and surprisingly one could not be located (a minor nuisance really).
Also had breakfast at the hotel one of the mornings and it was excellent.
Ask how late the live music lasts for the nights you are staying. Unless you are a very heavy sleepe...
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.