We stayed in the Cedar Sage campground for a month -- two weeks in site 5, then gone for the weekend, then 2 more weeks in Site 3. The loop is designed for smaller rigs, there is a 20-foot limit due to how the sites are laid out. 

There's a small parking asphalt pad and then the sites extend out to the side or behind the pad. There is a raised dirt platform area for tents or screen tents. Each site also has a fire pit and a large picnic table.  All the sites have the same sized parking pad (which seemed quite level throughout the loop), but the space beyond that pad varies quite a bit. Some are quite large and others a bit small. (Site #5 has a huge camping area with great sun in the afternoon.) 

Most of the sites seem to be good for privacy and all are well spaced out so you shouldn't feel cramped even when the campground is busy. 

The bathrooms in this loop seem new. They are well-designed and clean, plus they have shower rooms that are separate from the bathrooms. The showers had great pressure and plenty of hot water. 

Cellular service was good for Verizon and T-Mobile overall. It could periodically get weak but would come back quickly. We used Verizon and T-Mobile for video calls and other work and did just fine. Occasionally had to use our cellular boost to get great service, but it was decent without the booster, too -- at least in sites 3 and 5. We heard from others and noticed when walking around that some sites had less cell signal. (Probably depends on trees and terrain, as some sites sit more on a hill than others, and surrounding trees vary from site to site. 

The park boasts miles worth of trails, some that take you along the Guadalupe River. Note that it doesn't take much rain before they close the trails down (first closed to bikers and equestrians, but then to hikers, as well).

The park is very popular and fills up on weekends, even in the winter. During the summer, we've heard it's extremely popular. If you can't get a campsite, there is a large day-use area near the river to enjoy. 

The park is about 3 miles down the state park road before you even get to the entrance, so you take that into account if you need to run to town for supplies. But a Walmart and HEB+ are about 8 miles away(although driving time is deceiving because the hilly, curving roads mean taking things slower with an RV).

If we have a need to be in this area again, we will definitely look at booking here again.