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.
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.
Islands can "float" as well. Smaller islands used primarily as an aid in cooking or baking can be fitted with wheels and moved around the kitchen as needed to aid in cooking. Whether you consider a floating island will probably depend on what you have installed on the floor now, or plan to install (a soft wood will be nicked and scratched).
Include a ventilation hood overhead to eliminate smoke, steam and cooking odors if your kitchen island is going to have a cooktop. The range hood should extend beyond the cooking area by 3 inches or more on the sides for proper ventilation. Using the correct fan size will ensure that removal happens as intended. Have a fan capacity of about 50 cubic feet per minute (cfm) for each square foot of cooktop area.
kitchen island furniture
kitchen island with stools
kitchen island lighting