We had a lovely experience at Frits studio, it is perfectly located in the heart of Jordaan that was, according to us, the best neighborhood in Amsterdam. Plenty of cafes, restaurants and bars are literally steps from the studio and even though it is a street level flat it was quite and comfortable.
I would recommend it for 2 people, we were three girls and ended up sleeping in the double bed because the single bed is placed in a narrow recess and not in the main room.