I loved:
1. The convenience of being within walking distance of the Convention Center (4 or so blocks)
2. Close proximity to the grocery store
3. The proximity to the metro and bus stop
4. Spacious room and bathroom with pretty much all the basic necessities
5. Flexible check in and check out times
The only (tiny) annoyance was that the room heaters took a while to get up to temperature so when walking in the room, it was a bit cold for a while. Also, an ironing board and iron could be useful to some people, even though I did not need them during my stay.