We stayed a week over Christmas in a three bedroom apartment at the Ferienhaus Matterngruss. The apartment was very spacious and ideal for two families to share with two separate bathrooms. The bedrooms are very big with plenty and cupboard space and a sink in each room. The kitchen is spacious and well set out. We had trouble working the coffee machine and the owners came down to help us work out what we doing wrong.
There is equipment storage in the basement but no drying room as such. Washing machine and dryer are provided for all residents in the basement, coin operated. However, there were no instructions anywhere for use, which was very frustrating.
The apartments are in a good location - walking distance to the main shopping areas but far enough away from the bars to avoid noise. A very good accommodation choice in Zermatt.