Small but reasonably well furnished top floor unit in a big, interesting building. Heaters, good Wifi, full kitchen with dishwasher. You may be looking into this unit for the location, and I can attest that it is very well placed: very close to the Gamla Stan and Slussen T-Bana stops, or a quick walk into Södermalm or the city center. Ferries also dock close by. The location comes with some background noise (mainly of the drinking variety, on weekends) but it's not noticeable within the unit, no trouble sleeping whatsoever.
The ceiling is potentially an issue for some taller guests, but we were okay with it. The center of the main room has only about 6 feet / 1,8m of clearance, which is hard to capture in the (otherwise accurate) photos. The kitchen and bathroom are a good deal taller.
Communication with the host was fast and streamlined, and we never had any trouble getting in or out of the building.