I regret writing a bad review, but this was a terrible experience. I strongly advise anyone reading this not to rent this AirBnB.
Quick Version: The 6th floor becomes incredibly hot and the tiny portable AC cannot handle it. It is not possible to open the window. Even with the AC unit going at full, the room remained between 89-91 degrees. It was incredibly uncomfortable, and we left after 4 hours ( which we didn't even spend in the room).
Long Version: We arrived just after 7pm. There was a slight problem checking in as they sent us the wrong code, but responded fairly quickly. The room and entire 6th floor was incredibly hot. The room was very small ( this is a typical Seattle micro apartment), and the portable AC was going on full with the window closed and the vent blocked. I did not measure the temp, but it was likely in the mid 90's. I opened the window to its maximum which is about 3 inches, but it is covered by a taped-in plastic guard for the AC unit. It was really too hot to stay in the room so we left hoping the AC would cool it down. We returned 2h later without much change even though it was cooling down outside (but not on the 6th floor). The thermostat on the wall read 91 degrees. I contacted the renter and asked if we could be moved to lower room, but they had nothing to offer and the sent some one to check the AC unit. She did, and replaced the vent on the window. Honestly, neither the unit or the vent was the issue. The building has serious ventilation issues and the heat gets trapped in the upper floors. Their little portable AC unit and sealed window is not even close to dealing with this. So, we went out again still hoping the room would cool down. We returned at 11pm and the room was 89 deg despite being in the 60's outside. At this point we packed up and left. So, we had the room for approx 4h though it was too hot to actually stay in the room. I contacted the renter when we left and they responded the next day. They initially said I refused to let their maintenance person inspect the unit and declined any refund. When I advised them their person did inspect the unit they still refused a refund and told me to take it up with AirBNB.
So, in summation, the unit is very small, terrible ventilation, and a heating/cooling issue that puts the room in the upper 80's-90s. When contacting the owner 4 different people responded to me at various times. It gave me the impression that this was a group with a bunch of sub-par micro apartments trying to make a quick buck in Seattle. For the same cost or less you could get a hotel room that is 2-3x as large, has functional AC, and far more amenities ( we did!).
On a personal note, this was my wife's birthday. After a very long drive we just wanted to relax and have a quiet dinner together. Instead we spent it out waiting for the room to cool down, trying to eat on the very windy rooftop, then packing up and moving to a new hotel in the middle of the night. These things happen, not the end of the world, but had I know I'd have gone someplace else.