Count seats and clearance together
Start with the number of people who eat together, then leave enough room to pull out a chair and walk behind it. The usable dining footprint is larger than the tabletop.
Round tables help conversation; rectangular tables help zoning
A round table can soften a compact room and remove sharp corners from a busy path. A rectangular table often works better against a wall or in a defined dining zone.
Check lift, stair and doorway access
Measure the route before selecting a solid or extendable table. Confirm whether the top arrives assembled or in pieces and who is responsible for installation.