I mentioned to the sample of this item on the Argos website.

(Sicily 3 Seater Swing Hammock- White)

Anyone could you tell me please, if any possible to use this item to the indoor setting? because we don't have the garden.
Yes. We have a space but we're living in the 4th flour. so
Is this safe for the children?
Thanks 4 the answer.

Any outdoor or patio swing or hammock can be used indoors. Here are a couple of examples below. The deciding factor being how much room you actually have, Remember, the hammock/swing will need a lot of room, especially with kids, because it will be swinging to and fro.

The safety of the install is dependent on how it the Hammock or swing is anchored and the material that the anchor rope/chain and eyelets are constructed with. If you plan on putting it indoors, make sure it is anchored to very sturdy ceiling beams and made with quality materials.