https://bikecity.nl/Bike city has the incognito bikes you are looking for but is not super centrally located. It’s not that far of a walk.
https://www.frederic.nl/main/Frederic also has incognito bikes and is very centrally located.
I’ve used both and they were good. I used bike city as it was really close to a hotel I was staying in.
If you’re capable of safely using a bike in Amsterdam I would recommend renting one for the entirety of your trip. Doing this adds an amazing dynamic to the experience. Also good for getting out to Singel and De Pijp.