Our family of 6 stayed here recently. We have two teenage children and 2 elementary age children. We managed to sleep all 6 of in this place, but I would not recommend it for that many people, especially if you don't want to hear your children complain about hard beds or fight over the air mattress (the fold out beds are pretty hard). I would say it sleeps 4 people, as other reviewers have said.
Check-in and checkout were very easy. Our hosts were very responsive to our questions and concerns.
We liked the location; it was easy to get around town using the metro. We utilized the kitchen for most of our meals and It's pretty adequate. It's not stocked for gourmet cooking, but for a few days it's just fine. It's great that the washer and dryer are not coin operated. We used those a couple of times and were grateful that it was available.
This place is a basement and has a musty smell which, if you have a sensitive respiratory system, is something to be aware of.