We stayed at the hotel during the summer vacation. It is clean and the room we stayed in was large and nicely equipped. You are at a short walking distance from public transport, and if you decide to walk into Delft it will take you a maximum of 25 minutes to the center.
Breakfast is identical each and every day, not varied, and not very tasty. It is better to eat at a different place.
The minus side was the personnel, some of whom seem unhappy to be working in a hotel and to work with guests. For example, at breakfast: the older personnel was unfriendly and one lady even looked disapprovingly at her watch when we came to breakfast at 09:40, because "breakfast is until 10".
Or, another example: On the last day of our stay we came back from breakfast and discovered our key did not open the door anymore (all our suitcases were still inside). The receptionist did not offer any explanation or apology, just handed us another key.
These are just two examples of several incidents. Generally, the atmosphere in the hotel is not very pleasant. I would recommend the hotel for the location and cleanness, but if you want a place with a warm, friendly atmosphere for a vacation, this is not.