The only real consideration in buying this style of table is whether to go for an upmarket one, such as a French colonial table, or one with the rustic appeal of an English country farmhouse.
If you want to be more flexible with your guests, pay attention to the leg width and where the legs are placed. In general, a table with thinner legs, or where the legs are at the corners, will make it easier to squeeze an extra chair in.
While its important not to go over the top, a well-presented dining room will always have an injection of colour. It doesnt have to be bright yellow. It could be a subtle light green with matching curtains that have a pop of pink in them.
If you have an outdated dining table and chairs, it may be worth investing in some new furniture to help present the room in the best way.