During one of our many week-end trips to Zermatt, we spent just one night here after checking out from another awful one night experience (Gornergrat Dorf Hotel - separate review) in Zermatt. We were delighted with this hotel. Despite the last minute booking everything turned out to be perfect at the National Hotel. We had a big triple room with nice furniture, two balconies, clean bathroom etc.
The breakfast buffet is excellent with huge choice (both hot and cold), the bar was great in the evening. We didn't try the hotel restaurant since only on B&B but I heard the food was good. The staff was very helpful and smiling. You need to be aware that the Gornergrat train passes by just in front of the hotel. The train is not noisy though since it's a cablecar. To avoid frustration ask for a room on 3rd or 4th floor which will take you up above the train level and provide you with a better view.

A plus for this hotel is their big spa. It has a not-too-small swimming pool, massage facilities and a number of different other installations (jacuzzi, sauna, steambath etc etc).