Hands down the best accommodation in Amsterdam for its price, taking into account its excellent location in the richest area of the city.
The space is very modern, the 2 single beds are very comfortable and the double sofa-bed is great as well. The bathroom is very roomy and the shower is modern. A great view of the street from the huge windows the apartment has. Even the kitchen has everything you need to cook, with a big table to sit around.
There is adjustable heating and it works perfectly. Almost certain that there was floor heating as well. The internet is very fast (around 200MBps) and stable.
The only thing you need to be aware of is that the stairs leading to the apartment are relatively steep and narrow, but given the overall fantastic location and condition of the apartment, that shouldn't hold you back from staying here. I would definitely book this accommodation again in the future!