Nice room, but heavily scented
I like the Liaison Capitol Hill Hotel, but I am only giving it three stars, because it gave me a headache. While I am not allergic, exactly, to scents and perfumes, they do on occasion give me a terrific headache. My room at the Liaison had some sort of air freshener whose scent was cloying and inescapable, and inevitably gave me a headache. It might be a feature that others like, but I couldn't get away from it, and it made me feel sick. Disappointingly, the room has beautiful huge windows, but they are sealed shut, so I could not air out the room that way. I probably should have called the front desk to ask them if the scent came from some sort of plug-in (as was the case my hotel room in Italy), which would have been easily fixed, but for some stupid reason, I never did. 
Had the hotel been unscented, I would have liked it a lot. It is the first place I have stayed where there was a pillow menu, and as ridiculous as this seems, nevertheless I could not resist trying one. There was a buckwheat pillow, various down or hypoallergenic options, and a magnetic pillow that is supposed to help with stress and knotty muscles. This is the one I requested. Turns out I was so exhausted by the time I got back for bed that I didn't even use the thing. The substantial pile of the pillows already on the bed was just fine, and the bed itself was pretty heavenly. It had a firm mattress, good smelling clean sheets, and a nice down comforter that would have been especially perfect if I had been able to open the window to catch the breezes of an early fall night. (Yes, I'm mad about the windows! It's such a waste, especially when you can see that they used to open, and the latches have been removed.) 
Others have said that the hotel's bathrooms are tiny, and they are not ample, it's true. However, as I don't spent a lot of time in the bathroom, I didn't care. What I do care about is that this is the first place I have stayed where they don't use those insanely wasteful individual bottles of shampoo, conditioner and shower gel. Instead, there are full size bottles with pump dispensers on the shower wall, and I could not be more thrilled about that. I didn’t recognize the brand, but having used it, I ended up clean and smelled good, so that worked well enough for me.
There is also decent Lavazza coffee to make in your little individual coffee maker in the morning. Sadly, there is no liquid creamer, only packets of that nasty cancer-inducing non diary powder. There's no mini bar, but a ton of Fiji water, in case you are thirsty. Be warned it will cost you handsomely if you break one of those open, but at least they warn you what the price will be. 
There are always a few hotel features that I don't check out, but feel I should mention. In this case, that would be the rooftop pool, which sadly had just closed for the season. It is possible that, from the roof, you might get a pretty spectacular view of the Capitol building, but if not, it's only a couple of block walk to get that lovely view. The Liaison would be a great place to stay for anyone who had business on the Hill, but there is not a terrible lot going on in the area at night. The hotel does have a restaurant which appeared pretty popular, called Art & Soul. There is also a horrible looking soulless Hyatt across the street, which probably has a restaurant or two in there as well. 
The last couple of things I will mention abut the Liaison is that every staff member I interacted with was a delight, and the valet parking, should you have the misfortune of needing it, is punishingly expensive a $48 per night. Ouch! Street parking in this area might not be too difficult, but it's probably a bad idea. Better just to leave the car at home if you can, and rely on DCs Metro system (the Liaison is very close to the red line Union Station stop), so you can use that $48 to buy yourself a nice dinner instead!