Awful
I was in town for one night to attend the NRA Show on Monday night. When the room was booked it was stressed that it must be non smoking. When I checked in I again asked if the room was non smoking and was assured that it was "as booked, non smoking". I checked into my room and dropped my bags quickly to join my collegues in the lobby to get to the show. My room smelled mustly, and not fresh. It smelled a little like smoke, so I again asked front desk if they were sure it was a non smoking room. I explained that I have severe asthma and would be sick if it were not. The young lady at the desk replied, "I already told you it was non smoking". 
Upon returning for the evening, I got into bed (it was around midnight) and fell asleep only to be awoken by cigarette smoke coming from the next (adjoining room). Horrified, I wet a towel and put it at the bottom of the door. It was 4 am. The person next door continued to chain smoke until 6 am when I called the desk and explained what had happened. The woman on the phone explained that although my room was non smoking, the room adjoining mine was a smoking room, indeed, the entire floor was smoking. Hence, so too was my room, and they had lied to me. 
Let me add to the above the 4 hairs in my bed (not mine) the red stained washcloth, the long black hair in the bath tub and the long black hairs stuck to the (clean????) bath towels. I have pictures which I will not share here - but can provide.
I am home now, had to go to emergency for a ventalin treatment and am horrified at this hotel. 
The woman on the phone with me at 6 am offered to move me - we were checking out at 9. Too little too late!
As I have worked in the hospitality industry for all of my life, I get it - things happen - what gets me is the front desk clerk who put my health in jeopardy by lying about the room category - especially after I advised her I have severe asthma and would be sick - 
At the end of the day, I want a full refund for the night's stay at a minimum - it is fortunate for you that I live in Canada and did not incur any out of pocket expenses from my trip to emergency trip or I would be seeking those funds as well.