From Porter Square toward Alewife.
North Cambridge includes single and multi-family homes, larger apartment buildings and commercial uses. The right locksmith request describes your particular opening within that mix.

Include the city on Massachusetts Avenue
The municipal neighborhood guide follows Massachusetts Avenue from Porter Square toward the Arlington border. Give Cambridge or Arlington as part of the address rather than relying on the street name alone. If a property has more than one entrance, say which one is involved and add the unit or business name.
One household or a shared building?
For your own house, list the doors you want rekeyed or assessed. In a multi-unit building, distinguish the common street entry from the unit lock. Identify the person who can approve work. A shared key system needs a different conversation from changing a private deadbolt.
A familiar door that starts sticking
Describe what happens when you use the handle or key and whether the door needs lifting to close. Mention previous changes to the hardware if known. A repair assessment can consider the opening as well as the lock; buying a replacement first may not address the actual fault.
A car near Alewife needs a precise location
The city identifies Alewife and Cambridgepark Drive as part of the western neighborhood context. For vehicle help, give the parking facility or street, level and entrance as relevant. Have the make, model, year and key situation ready. Confirm availability for the actual location rather than assuming a landmark determines timing.
For this situation.
Can I describe the location as near Porter Square?
Use that as an extra reference, then give the full address, municipality and entrance. The square name alone does not identify the property or vehicle.