This was my 2nd visit to Atos & i'm actually looking to go a third time this summer. The reason why is simply because of the location which is great. Close to everything in the center of the city & close to Mala Strana/Charles Bridge. If you don't mind walking (i don't) you'll never have to get on a vehicle n the city at all. Also the hotel includes a good basic breakfast. The rooms n themselves are pretty much basic hotel rooms with mini-bar & TV. The only bad thing i have to say about them is that none of the 2 rooms that i've had, had air-condition. And none of the two rooms had any decent water pressure in the shower. But besides that, as said, i'm looking to go a third time, as those are not deal-breakers for me. Cause location, basic decent standard & price-level = a good choice. But this is a 3 out of 5 star hotel, meaning that there is NOTHING "luxurious" about it at all (but then again, nothing low class either)
So if you plan to be in your hotel room a lot during daytime, if you mind walking during your visit, or if your demands of comforts are high? Then this is not your hotel.
Otherwise, go for it.