Our family meets my wife's siblings and their families every year for a family vacation. This year we chose Guntersville, and converged from 3 different states for our vacation. We need a large home (6 adults, 9 kids), and this home was perfect! The pool kept the kids busy when we weren't out on the boat tubing. The large number of bathrooms meant no one had to wait for a shower. The layout of the bedrooms is a little awkward, but if you think you may need more space, there is a bar/media area downstairs that can easily be used to sleep a few more people.
The road to the house is very narrow, so much so that my brother in law was not able to trailer his boat to the driveway. We ended putting in at a nearby boat launch and motoring over to the house's dock. The clearance of the bridge you must pass under to access the house is very low (we had a center console Hurricane boat that fit with only 3 inches to spare!), so be aware of that.
As noted in other reviews, this house has been well-loved, but everything functioned, and Sam was very responsive to texts/calls after we checked in. One disappointment was that the paddleboard was not available. This may be something you want to confirm before getting your heart set on sunrise paddles each morning.
We loved staying here, and may come again. Not only was the house perfect for us, the area has a variety of activities for all ages. I recommend Guntersville State Park (hiking, biking, and swimming), High Falls Park (cliff jumping and wading), Papa Dubis (incredible Cajun food).