Please bear in mind that my remarks are based on a prolonged stay (one month) and as such other travelers staying for shorter periods of time might have different experiences. I will list both my pros and cons.
Pros:
The location of the hotel is unbeatable, situated right across from the Mauritshuis and the Parliament, it is right in the center of everything. Shopping, restaurants, bars, cultural institutions, and the train station are all minutes away on foot.
The hotel itself is pretty clean with daily cleanings performed. The staff is generally attentive and helpful, and react fast to requests.
The breakfast they provide is a big extra, which they freshly prepare daily (although it can get pretty boring after awhile as there is not a big variety). Because of COVID, I would have appreciated if they covered every food, but other than the hot meals, everything is exposed.
Cons:
If getting fresh air into your room is a must for you, do not book a room overlooking the Parliament, because the windows cannot be opened. This might not be an issue if you are only staying for a few days, but when you are there for weeks time, the room gets very stuffy, dusty, and deprived of oxygen, which triggered both my allergy and headaches. Booking a room overlooking the back will also save you bucks as it is cheaper.
The kitchen area is very very small with an even smaller stove, and it wasn’t as well stocked as it claims (for instance no oil, salt, etc., at least not in my room). With windows that you cannot open to take the smell away, cooking is virtually impossible in this space. Again, this might not be an issue when you are staying for only a few days, but it definitely can be a problem when you’re there for awhile.
While I appreciated the attentiveness of the staff, at times it went overboard. I was there for work and needed silence and no disturbing, hence I only requested cleaning once a week. I received phone calls from the desk several times (sometimes late at night) that I remove my do not disturb sign, even at times when my room had been just cleaned the day before.
It is an overall reasonable accommodation with many nice features and a great location, but it works the best for a touristy stay that lasts for a few days. I would definitely come back here for a short period, but would opt for an actual home for work related trips.