Nothelle are a tuning firm based in Germany mainly dealing with VW and Audi.
The receipt on the ebay add doesn't state its Nothelle suspension and I cant believe they would go to the bother of making their own so you can bet its Koni suspension.
Any coilovers with adjustable height will enable you to set the ride height to suit your needs. Ride quality will depend on the make you choose and how much money you spend.
Paul