Went with wife and 15 and 14 year old teenage sons. Very friendly staff who communicated well via email prior to holiday. Natalia greeted us and was very friendly. Booked Auchwitz trip for us, picked up and dropped off. Small but adequate dining area for a traditional polish breakfast - cereals, meats, cheese, fruit, tea, coffee etc which was fine. Hotel rooms was up a spiral staircase and unfortunately the roof had leaked onto the staircase slightly but was safe enough to pass. Basic but comfortable rooms, very clean. We went over the weekend and it was slightly noisey due to us being next to the square but wouldn't let this put you off, it wasn't too bad. Brilliant location, right next to the square with it's bars, restaurants, trams and buses and tours if you want them.
Price wise, Krakow was really cheap in comparison with other major cities. Very reasonable prices for food and drink and normal uk prices if you want to treat yourself to a malt whiskey for example. All local staff very helpful and friendly. We used a tour guide and paid a little extra for the Auchwitz trip which I would recommend with a pick up and return mini-bus which gave you a pre-tour video on route. We paid approx £25 each in comparison to £13 if you make your own way on public transport and into the sites.
We also paid over £20 each for a 'segway tour' which was slightly dangerous at times. ok if you like lots of churches.
Overall, a lovely place, friendly people and reasonably priced