I would recommend a Sonder stay to anyone visiting New York. The apartment we stayed in was well-equipped with all the basics we needed, and very clean. Sonder is ideally located for easy access to the city, with multiple subway lines close by. Unfortunately the pool was closed when we visited (and in April it would be too cold to enjoy!) but we did explore the rooftop area which was gorgeous. We used the gym/fitness centre, which was a little smaller than we expected but again well-equipped and fit for purpose. The staff were friendly and helpful, responding quickly to the one problem we had (a stiff latch on the door). There is also a little cabinet of essentials next to the check-in desk, which came in handy.
The one thing I would suggest visitors to approach with caution has nothing to do with Sonder, and that's the price of groceries in the city. I generally prefer self-catering for freedom and saving money, but in this case the small shop I did was extraordinarily expensive (though I understand this is quite normal for NY). It may be worth hunting out a cheaper store farther away from the financial district.
Generally, I found it to be great value for the area and facilities and if/when we return to New York in the future I would definitely explore re-booking. Thank you for a great stay!