Our first TT was a 20 footer as in the floor plan below. We thought it was going to be our forever trailer. Only lasted one year until we discovered it was just too small and cramped. No slideout. It quickly got rather annoying having to squeeze by each other between the kitchen count and bathroom. Watching the TV from the dinette seat was quite uncomfortable. Could not comfortably relax with no sofa or recliners. Low on interior storage space. The best thing was how easy it was to tow a short trailer anywhere.
We ended up getting a 29' TT with one slide, a sofa, large walk-in shower and an efficient floor plan. Lost thousands of $$ when we went to sell the old TT.
Don't jump into something that catches your eye without doing adequate research. If you can, it might be a good idea to rent a TT somewhere and see what you think. Some CGs have rental units on site. There are some better layouts in shorter TTs than others so choose wisely. I think a kitchen on one side and dinette opposite gives more circulation space. You might find that a trailer in the 22-23' range may a whole lot better. A slideout is a great feature to have as it really opens up an interior.
Be vary wary of advertised cargo carrying capacities. They are often way less than expected.