ok but location
Arrived on Friday evening and this was my first time to Detroit. Valet parking ($25 per day with in and out privileges) and check-in was a breeze and as there was no one else there at the time. Was given a normal king-bed room on the 12th floor. The room was decent size but whilst it was clean, comfortable and modern, it didn't have the luxury touches that I would have expected to come with the Westin brand. Maybe they have different market positioning in the North America market as compared to Asia (where I have stayed at extensively). My only complaint was that it was not really walking distance to anything else, especially given the bad rep that Detroit has got for crime etc. I guess the neighbourhood felt particularly deserted on the weekend as many businesses were closed. It is of course not an issue if you have a car. 
One other issue that I have with this hotel is that the walls seem to be very thin. You can literally hear a conversation that is taking place in the corridor and in the next room. I was woken up twice at night by people talking whilst walking past my door down the corridor...