The best option for a Safe Space (in descending order)
1. Mamad (safe space within a home) or Mamak (protected space on a floor) are the preferred choice.
2. Shelter:
A shelter in a shared building - provided that it is internal and located inside the building, and provided that it can be reached through an internal stairwell, regardless of the time of the warning.
A public shelter - provided that it can be reached within the required period of time from the moment an alarm sounds.
3. Internal stairwell:
Residents who live on the upper floors of a building that is more than three stories high and does not have a security room, emergency room, or internal shelter, should descend two floors and remain in the stairwell.
Residents who live on the upper floor of a building that is three stories and does not have a security room, emergency room, or internal shelter, should descend one floor and remain in the stairwell.

In a three-story building, the most protected stairwell floor is the middle floor (second floor). In a building over 3 floors, all stairwell floors are protected except the ground floor and the top two floors.

Do not stand in the entrance to a building, as there is a risk of falling shrapnel.
In an emergency, leave the door to the building open so that others can enter quickly. 

4. If there is no safe room or internal stairwell, an internal room should be designated as the safe space with a minimum of external walls, windows, and openings.
Do not choose a room with a shower or toilet, as ceramics, porcelain, and glass may shatter.

For more details, visit the Home Front Command website.