The place is extremely clean and well appointed with all the things you need. It's quite roomy. The beds were very comfortable - I'd say it sleeps three comfortably as one bed is a futon. The walk to the nearest Metro stop is no more than five minutes. Check in and out was a breeze and our hosts let us leave our luggage the last day. It's a great value and I would stay again.
It was a little noisier than expected. I definitely would stay again but I would bring earplugs for sleeping.
The alley access was as described but snow was not plowed out of the alley during our stay so access to the house required walking over slippery ice. It does not snow like this often in Washington and I found it manageable anyway, but this is good to be aware of.