While there are a lot of advantages to subleasing space, there are also several downsides:

• Sublease terms may be short and might have a definite end date. While this could be a good thing if you are not looking for a long-term office solution, it might cause a problem if you get settled into an office only to find out that you have to leave.
• Since you will not be the primary leaseholder of the space, you might not be able to make customized improvements or any rearrangements in the office that you would otherwise have the liberty to do.
• There is always a chance that the sublessor will stop paying the rent to the landlord for whatever reason. In that situation, you might also become subject to the default that arises as consequence.
• In an office share situation, you will probably have to use common facilities that other companies also have access to. Make sure to find out how many other people/companies will be sharing your spaces (and what they are like) before moving in.

While there are certainly some risks involved in subleasing, it does offer extraordinary flexibility and (usually) a cheaper monthly rate, so you should not be discouraged by the above scenarios. Just make sure to do ample research and understand the situation that you are getting yourself into before actually entering it.