Give a vintage trunk a sensible job
Treat an old trunk as an object with limits before assigning it a new role.

A vintage trunk can bring texture and a strong shape to a room, but its original purpose does not tell you what it can safely do now. Age, condition, hinges and materials all matter. Calling it a coffee table or a bench does not change how it was built.
Start with a close inspection. Look at the base, handles, hinges and interior, and ask about repairs or missing parts. A decorative exterior can conceal a damaged underside. Unknown odors, moisture damage or unstable surfaces deserve assessment before the trunk comes into a living space. Do not assume that a lining or a coat of paint will solve an underlying problem.
Avoid using a trunk as seating unless it is known to be suitable for that load and purpose. A flat top is not evidence of strength. Likewise, an old lid can be heavy or close unexpectedly. Where children may have access, entrapment and lid hazards make old chests a particularly poor choice for casual toy storage without a competent safety assessment.
Give it a modest job
A sound trunk may work as a decorative low surface or as storage for appropriate items, but check the finish and construction first. Use surface protection suitable for the material if objects will rest on it. Keep liquids away from leather, paper or finishes whose care is unknown. A tray can organize small objects, but it does not make a weak or uneven top structurally suitable.
Consider how often you will open it. A trunk used for storage becomes inconvenient when the top holds a lamp, books and several decorative pieces. If access matters, keep the top nearly clear. If it is primarily a display object, do not count its interior as everyday storage.
The scale should fit the room. Large metal corners and straps can make a trunk visually heavy even when its footprint is modest. Leave enough walking space around projecting parts and check it from the nearest seat, not just from the doorway.
Some pieces are best enjoyed without giving them a new practical role. An old trunk can remain a decorative object while a modern table handles drinks or storage. Respecting its limits often preserves both its character and the usefulness of the room.
Further information: CPSC: storage and toy chest hazards.