The name fits...
The Ace Hotel is, well, "ace". Very friendly and helpful staff at checkin. Great design and location in Belltown, not far from Pike Place Market and near tons of great restaurants, shops and bars. A great breakfast was included. Downsides (which didn't bother me but might be an issue for some): There's a steep staircase to get to reception, which is on the 2nd floor of an old but cool building. But staff was great about volunteering to help with luggage. There's no on-site parking. The hotel offers parking for a fee in an unattended lot a couple of blocks away.