18x18 is the largest footprint you can build a fully custom house on, which makes these plots the ones people actually design rather than settle for. You get the room for a proper vendor frontage, a real storage floor and a layout of your own instead of working around a fixed floorplan.
This one sits in Felucca, and that is a deliberate choice rather than a downside. Felucca is where champion spawns run and where resource gathering pays double, so a house on that side of the mirror puts you next to the content that funds everything else. It also means the ruleset is open — you can be attacked outside your door, and you should be ready to fight or step inside.
Placement is the hard part and it is the part we do. Add the location you want to your order notes — near a specific dungeon, a moongate, a bank, a champ spawn — and we will go and find a plot that fits rather than handing you whatever happened to be free.