In short, go ahead and book it. The building is new, secure, has a lift, and the location is hard to beat. It's only a few minutes walk to the Acropolis, city center, and plaka.
The rooms are comfortable with nice bedding and plenty of usable cupboard space. The bathrooms and showers work well with plenty of pressure and hot water. There are very clear instructions on how to switch on the extra boiler if the solar system doesn't provide enough hot water.
The kitchen has almost all appliances that you might need such as a fridge, cooker, oven, sandwich maker, microwave, and utensils.
The jacuzzi worked well and it kept the water at a constant temperature. We found it already filled up and heated which was great after a long day traveling. Thank you.
As I said, its a short walk from the Acropolis area, center, and Plaka which meant a large variety of cafes and restaurants. There are also shops close by for essentials such as water, bread, tea, and coffee.
The check-in was seamless and easy through a lock box. All in all its a recommended option when planning your trip to Athens.