It's a cosy little hotel and well located, 3 min from the Westmarket tram stop that will take you to amsterdam central. Also just literally next to the hotel there's a bike rental shop, so that's very convenient of you want to explore the city by bike. Staff of the shop are very friendly.
The hotel staff was very friendly. My room was very small but comfortable and clean.
The only thing to be mindful of are the extremely steep quite long set of stairs of the entrance. Also had to climb stairs to the floor where my room was. I guess it's just how the stairs of many Dutch houses are and this is probably an old building so it has no lift.
The reception gentleman helped me up with my small suitcase. But If you have a lot of luggage, large luggage, or are someone with any sort of mobility problems, knee pain, or elderly, staying here would be problematic. So in that case find a place with a lift!
The breakfast was included and it was nice. You can also have coffee or tea included in your tarif at any time of day.
I think relation price/quality is pretty good considering how expensive hotels in amsterdam are. I wish I had found this hotel before. The previous night I stayed in in a different place, closer to the center and around the same price, and it was an absolute hellhole (Old quarter hotel, don't stay there).
Ah, Hotel Clemens also has two adorable cats hanging out in the lobby, which for me is a plus for sure! Pet with caution!