We stayed here for a week in March 2023 for our spring break. We are a family of 5 and the sleeping arrangements were perfect. We did not spend a lot of our daytime in the apartment as we were there for sightseeing, but we did not feel cramped during the times we were there. The outdoor space was a nice bonus, it was private and relaxing. The apartment itself is fresh and modern, everything worked exactly as expected.
The property manager is really great - we communicated a lot throughout the week about a variety of things, such as how the included transit card works, where I might park a car I rented for the day, and how I could extend our stay. I wondered if the manager might be exasperated with all my questions, but I received fast, friendly, and helpful communication every time.
We loved the location - it was close enough to everything to feel lively when we went out, but quiet inside for sleeping and relaxing when we needed a break. The location is right between Marktplatz and Barfusserplatz (in terms of transit stops). Getting to and from Banhof SBB is easy via tram. And, grocery shopping is easy with several groceries nearby. We didn't do any major cooking, but the basic pots and pans are there if you wanted to make a small meal, and we did a couple of times.
I would highly recommend this apartment to a family, but it also would be great for a business traveler coming to Basel for an extended stay. We really enjoyed our time and would definitely come back.