We had a lovely stay at Carolijn's apartment. I highly recommend staying just outside Centrum instead of in the heart of tourist Amsterdam.
The apartment is along the beautiful Amstel river and near to Amsterdam University, which means on sunny days there are plenty of places to sit outside to enjoy the beer and watch the water. The area has youthful energy but the street you're on is very quiet and residential, which is a great balance. Down the street is Café Restaurant De Ysbreeker. There might be a slight wait outside if it's a nice day, but it's worth it. It's also right across from the De Pijp neighborhood, which has plenty of places to eat and drink.
If you're here longer than a day, rent a bike at City Bike Oosterpark down the street and enjoy the 10 minute bike ride into the heart of the city or Museumplein through the canals instead of waking up to crowds. (Don't worry about your bike getting stolen as long as you lock it properly--tourist bikes are the least attractive targets.)
Again, the apartment is in a lovely area and I would argue a much better way to experience Amsterdam than solely being crammed into tourist town. Thank you to the hosts for great communication and stay.