We enjoyed our stay! We were in town for a short weekend trip, and had three girls, so the two rooms worked out perfectly for us.
The pictures accurately depict the downstairs space you will have access to. There are heaters both in the large area and in each room (and as a perk, there are heated covers on the mattresses of the two main beds), so you will stay plenty warm if the weather calls for it. (but I'd still recommend bringing some slippers or socks for the tile area if you have them and think of it)
We were a short walk to the beach (and a very fast drive to eating brunch right on the beach) and about 20-25 minutes from the airport, so this worked well for us as a home base.
We appreciated that we were able to check in late, and the response time to our messages was very timely so we could plan as needed.
Although this is the downstairs of someone's house (and as the other reviewers indicate the doorway to the upstairs (which is away from the bedrooms and main living area of the basement) needs to stay open a crack for the owner's cat), it was very quiet and the owners were non-intrusive, so it did not feel like a shared space.