Some friends and I stayed at Michael and John's place for three night and we thoroughly enjoyed our experience! The space is extremely stylish, clean and comfortable and they are extremely accommodating hosts.
We forgot to request the air mattress before our stay - but they were kind enough to actually go out and buy a new air mattress and blanket for us (a previous guest had noted that there were inflation issues with the old mattress)
The laundry machine was a great touch for those on longer trips in need of fresh clothes, and while we didn't use the kitchen much, it was extremely well stocked with equipment.
Check in was self-serve and they were very quick to respond to any requests. Additionally, the location is convenient - it's a quick walk to the Metro!
If I'm ever in DC again, I'll be sure to check if this place is available!