Now I think it's easier to get the minor negatives out of the way first because this is an excellent hotel in a phenomenal location but it isn't for everyone.
First, if you have mobility issues or cannot carry luggage up flights of stairs, don't choose here. The stairs are steep and narrow in places. And I saw reviews complaining about the noise. My room was mostly quiet. I had two sets of windows that blocked out 98% of the noise. You are at the base of the Charles Bridge. It is HEAVILY touristed. But it is great to be so close to everything. Bring comfortable shoes for the Prague Castle hill climb!
I had the 3rd floor suite and would book it again in a second. I don't need spa treatments or a pool or several onsite restaurants. I need a unique, clean, comfortable room with some charm and a bit of local flavor. Nailed it. And the price is excellent for how nice the place is. Fast wifi, large suites, comfortable furniture, all in a very attractive room.
I didn't come to Czechia to stay in international chain hotels. I'm aiming for local flavor, local feel. Do yourself a favor. If you can handle the steps, and the front desk across the street, get a room here. And then step outside and stroll with everyone else on the bridge, soaking in the charm and beauty of Prague.