Consider the Services ; If you need a power supply for appliances, you can run it up through a pipe or conduit up to the ceiling, or even better, run a line below the floorboards up into the kitchen island. Make sure your installation conforms to local and national regulations. You are advised to employ a qualified electrician to do this.
Safety First! You are better off without it if you are using up all the free space in the room. Your kitchen should be spacious and you should never feel restricted in your movement - in fact it can be dangerous if you are. Yes, a kitchen island is good to have, but not if your safety and freedom of movement are compromised to accommodate it.
If you have a big island that can accommodate many people, consider using full benches. The benches can be with or without backing to allow for more comfortable seating.
If you have doubts, you could always ask a professional designer to go over your kitchen space and make a recommendation or, if you want to save money, you could visit friends who have a kitchen islands and make the necessary comparison. Moreover, you can choose for your kitchen island to be in an L, U, or a G shape.
small kitchen island with drop leaf
small kitchen island and table
small kitchen islands with seating