Visit the Hilton Garden inn in Leiden. With a cat the hotel is very difficult to find. You can see the hotel from the highway but there is no exit.
The hotel is new and the staff also, you can see they are missing experience. The check in was good but no really a Diamond recognizing. There is a restaurant with expensive prices. I paid about 17 euro for a burger.
The rooms are nice, they are new with flat-screens LCD's. The breakfast was to simple, not many choices.
The room-prices are low, so if you want to stay cheap at a Hilton, Leiden is ok. For a nicer Hilton i recommended Den Haag, Rotterdam or Amsterdam.