My wife and I were overwhelmingly surprised with the value we received. A $40 USD deal popped up which we immediately booked (it had a Best Price Guarantee which we took advantage of to save another $11). It was within walking distance of all public transportation, and on one of the main streets in Gliwice. Like others mentioned, keep in mind there are TWO Hotel Diaments within a block of each other, this is the cheaper one.
The staff was very friendly and helpful. Although checkout time was at 12PM, they allowed us to store our luggage at the reception until we finished with business in town around 3PM. We didn't dine in the hotel because the breakfast seemed pretty pricey in relation to the room price. The TV wasn't great (didn't bother us) but the speed of the internet and connectivity was excellent which was more important to us anyways. The room was extremely clean. We will return anytime we visit Gliwice again!