My husband and I stayed here for a low-key anniversary weekend. The place is nice, and probably your best option if you don't want to be staying in the lodge with all the kids, water park, etc. We stayed in the Pinto room, which was a great location on the second floor, end room.
The best part is the breakfast - made fresh and delivered to your room! The food was amazing and generous - we were able to treat it as brunch and have a light snack in the early afternoon. There's also some pictures on the website of the adorable rocking chairs, but they aren't as private as they look in the picture as they are all on the open porch/walkway area in front of all the rooms. Not a big deal, it was just not what I had assumed when looking at the pictures. But, the kitchenette is a nice feature; we made popcorn in the microwave and had wine that we could chill in the fridge.
The location is great, you're across the street from a cute ice cream shop, 2 blocks down the street from the 1-block downtown area with a couple little shops and restaurants, and only about a 5 minute drive to Starved Rock State Park (the entrance - if you want to go to one of the further away trails, it's a little longer).
There's only a few small drawbacks:
1. They close the front office at 5pm, so if you arrive after that, you're going to just pick up the key and not interact with anyone. It might be nice if they could stay open a little later on Friday at least, as I would venture to guess that a majority of their business comes from Chicagoland area weekend trippers. Even when you take a half day, it's hard to make it there by 5pm. It seems rather impersonal to not have any interactions with the staff when you check in.
2. They really make an effort for it to be a nice "spa-like" atmosphere with a jacuzzi tub, but the regular shower has a cheap, tiny shower head. It's simple & cheap to replace those with bigger, multi-setting fixtures, but when I got in the shower it just snapped me back into the feeling of an old college apartment!