Clean, modern, comfortable apartment in a terrific location. When we arrived, our Apartment (No.1) was unavailable because the previous guests were late checking-out, so we were given No.3 for the first night, then moved to No.1 for the rest of the stay. It wasn't a problem, the two apartments are very similar (No.3 perhaps slightly better?), and Christian handled it all promptly and efficiently.
Wi-fi was very good, though range of TV channels was very limited, Polish-speaking only. Very comfortable beds, both apartments.
Didn't really use the kitchen, because there are so many good and cheap eateries nearby, but I would caution against 'Cafe Vincent', which is immediately next door.
We went for breakfast the first morning and it was OK, but the service was slow and offhand. Out of laziness(!), we went again the next day and service was similarly slow. But much worse was that my partner was served a simple ham omelette which severely upset her stomach for the next 2 or 3 days. (I chose a different breakfast and it was OK)
Other than that, there are a number of very similar-looking apartments available to rent nearby, but Gold Apartments were noticeably cheaper when I went to book.