The Minhotel Kristaly may have an excellent spa center; we did not have the occasion to find out. Our room, however, was spartan. This might be acceptable, but the futon-style bed was lumpy, its bedspread torn and ragged. On the plus side, the heating radiator is not strong enough to overheat the room: turned to maximum, it had the room at 68 degrees F (20 C) when the air outside was about 30 F (-1 C). I'm not sure how it would do in midwinter. The bathroom was adequate but tiny (a positive spin would say it represents highly efficient use of space, but in truth it is very cramped). Lighting was dim; the ceiling light was only somewhat stronger than a night-light, and the small bedside lamps with their dark shades barely provided enough light for reading in bed. There was no table lamp on the desk, nor any floor lamp. The brightest spot in the room was in the room's entryway (which represented an inefficient use of space between bedroom and bathroom). Breakfast was mediocre; surely they can find better-quality bread and rolls without cutting into profit margin. The staff were unfailingly friendly.
Perhaps the spa justifies a three-star classification; the rooms alone do not (assuming most are like ours). I would not choose to return at the price we paid, but would look elsewhere in Keszthely.