Not so great at all!!!
My husband and I recently visited Boston and stayed at the W. It is our very first time staying at W hotel, but frankly I was not impressed at all. The rooms are small and divided with some kind of art piece from the bathrooms. The lights in the bathroom are horrible! I barely could apply any make up on my face and there was not a mirror behind the sink because the art piece that separate the bathroom from the room is right behind the bathroom sink. And all lights in the room were very dimmed. Since our visit was the wedding of our friends I was very disappointed that I could not apply any make up on my face because of the decor situation and the dimmed light everywhere in the room. As a female you can imagine the disappointment of not being able to "get ready" (lately I saw pictures taken at the wedding and I was so not happy with my look). Thank you W! Also, try to request a room on the upper levels at the hotel. Our room was on the 5th floor and all you could see from the "balconless" room was the part that goes right above the entrance-petty much you see nothing but cement! I had a very high opinion about the W hotels since I have visited some before. They are all different with unique design, but this one in Boston is neither unique, or even close to a "different" in an equal way to the rest of the locations. The lobby was small as the rooms. Very strange looking. When you enter the lobby you see a lady on a PC desk that does not really feel right to be sitting on that desk placed right next to the door. You wonder where you should check inn-at the ladys desk, or the other one that is a few feet away from her. 
After all the location is great. Close to everything and also there are two T stations around. We did not use a taxi from the airport because the train worked just fine for us, On a way back there was a car that took us to the airport. You just have to ask and that was great after all.
There is another interesting story. After we visited our friends at next door hotel - The Revere Hotel, which I highly recommend (this hotel is modern with extremely classy look and all the rooms come with a balcony, and of course beautiful views) I can say I have never seen so modern and unique place! So after we came back from a few quick drinks at our friends place my husband needed a coffee. It was almost 4am. I asked the front desk about coffee and they told me they can make some for us. I asked for a cup but they ended up making a whole pot that they usually deliver to the rooms. My husband and I did not want to go in the room so we waited outside and enjoyed the clean air until the coffee was ready (we could use a balcony if there was one in the room, but we were just enjoying the night and did not really thought about having or not having one at that moment). When I went back inside to get the coffee they gave me the whole coffee pot. I asked just for a cup of coffee. I do not know how did they expected me to get the whole pot and take it out on the street in front of the entrance. I did not say anything, just decided to let it go! Even the price of $16 for this pleasurable cup of coffee was Okay at this moment, until the from desk guy opened his mouth and said that only in 30 min there will be a complimentary coffee served at the lobby. Why did he had to say that? I just payed $16 for that pot and I tipped you 20%?! I left so disrespected and the same time fooled. After that happened I refused to spend any money at this hotel. Did not touched even the mini bar! So do yourself a favore and go next door at the Revere hotel. Probably same price and way classy and hospitable!