To start with: the pictures uploaded on TA are not of the Golden Sands hotel, but of the hotel in Kamchia park (resort). Go on booking.com for the actual pics.
Good things about the hotel: good location in Golden Sands, close to the beach. But if you want to enjoy a less crowded part of the beach, you should walk a little bit more, and use the sands in front the Admiral hotel.
The rooms are spacious and clean, the staff is very nice and the cleaning is regular (daily taking out the thrash, changing sheets and towels after 3 nights etc).
If you want a good rest, ask for a room with a pool view. The other option is a busy street of the resort.
Bad things: bad, bad breakfast. I mostly settled for croissants, butter and jam. But if you get the room for the end of summer rates (approx. 25 euro/night/2 persons/BB), I say it's a fair deal.
The AC spreads a foul smell - I preferred not to use it, but the nights were chilly, so it worked fine for me.
All in all, I'd say it was a comfortable stay, and we enjoyed it.