The flat is a short walk from the Warren Street Underground, within walking distance of Regent's Park, the British Library and Tottenham Court Road. The room is quite small, just a bit bigger than the queen sized bed, but is stylish and well laid out, with lots of storage space to unpack luggage, and nice touches (water, coffee maker, snack/breakfast bars). The shared bath is tiny, probably built into a closet, and the shower could be a problem for a larger person. The hosts have made a small, basic sleeping space as comfortable and welcoming as possible - it isn't luxurious, but if you only need a convenient place to sleep, it's more than adequate.
Emilio and Svetlano were most accommodating, allowing me to stash my luggage before check-in so I could play tourist unencumbered, and responded to messages very quickly. I met both hosts, Svetlano helping with my heavy luggage and Emilio providing directions.