Good Hotel but needs to learn from its Mistakes!!!
We stayed in the Liaison for 3 nights in Nov 2012, having read some of the reviews i can see there are some recurring problems and Management really needs to learn from this!!
The Good
Large comfortable room with 2 very nice queen beds, 
Very clean and well maintained
Public areas very clean and well maintained,
Lift more than adequate.
Nice little shop (not well advertised) which is open late if you have munchies.
Staff very friendly and helpful (apart from 1 doorman see below for details which unfortunately means the service rating was poor)
The bad 
Wireless in this standard of hotel should be free throughout, Charging for it seems like a really daft thing to do as it means the lobby is always crowded with people making it seem very small and disorganised. 
No hotel should produce a check out report at 3.30 am unless the customer is checking out at 3.30 am. They do this for speedy check out however it made check out a lot slower as we had to add extra bits on to it, it also looks on the bill like the amount has been taken already without permission (even though they assured us it hadnt!!! ) i havent checked my credit card bill yet!!!
The ugly
Breakfast included should mean breakfast included. Breakfast included should not mean up to the value of $50.00 per room and oh by the way its between $15 to $20 per person for a decent breakfast so you will have to pay extra if you want both coffee and orange, oh and by the way you have to pay extra for tax. 
DO NOT use the door man to get a taxi for you. We requested a taxi from the door man and even though there were 2 waiting outside he waved them on and waved an old taxi over ( we have since realised this was probably a friend of his). We were only going to union station (5 min walk) but as we had 5 bags we decided the best thing was a taxi. We asked the door man what he thought the cost would be (we have been burnt by not asking before) and he advised not very much at all. When we got to the station the meter stated $5.50 (quite reasonable we thought) however the driver insisted we pay an extra $5.00 as we had 5 bags ($1.00 per bag). We didnt have time to argue as we were late for our train. We asked in the station and were advised that this was not standard policy in DC. We then asked another door man when we were in New York and were told that they had never heard of that policy in any state. As you can imagine this left a very bitter taste our mouth.
I would consider staying in this hotel again as the location was perfect but i would also look at others in this area as it was not perfect by any means.