Selma's apartment is a little top-floor paradise off the beaten path. Her apartment is well designed and very comfortable, and the balcony up in the trees is absolutely dreamy. (Pro tip: When you need a break from exploring Amsterdam, open up the balcony doors and take a nap on the couch with the breeze and birdsong.) We happened to stay during an intense heat wave, and even though there's no AC, we were able to open up the windows and doors and keep the apartment cool enough to be comfortable.
In terms of location, It's just a short Uber into anywhere into the city, and there are a few nice little cafés and restaurants nearby. The apartment is in a primarily residential area, so it also stays pretty quiet at night. The neighborhood always felt safe, and there are also two locked doors to get into the apartment for extra peace of mind.
In terms of quirks to be aware of, I'd only flag two things: [1] The bathroom is tiny, but very manageable and functional; [2] There are about 2.5 flights of stairs to get up to the apartment. It's a bit of a schlep to get your suitcases up there — and it might be a bit tough for seniors or people with mobility issues — but They're pretty steep, but there are handrails on each side that help.
All in all, a beautiful and peaceful little home away from home in Amsterdam.