Mathias did a fantastic job fixing a "running toilet" problem, i.e. a slow leak in the tank. He fixed it quickly and professionally, coming in within the estimated cost and turnaround time. He was very polite and conscious of keeping a tidy workspace and cleaning up after. He's also very bright, and figured out a hardware-related problem (puzzle) that I had been trying to solve, without ever having seen such an issue before. Above all else, Mathias is a great and honest guy. I would highly recommend him to anyone who needs the services he provides.