Syokimau is the obvious airport base but the Mombasa Road service lanes vary hugely in quality. Ask whether the estate exits onto the expressway feeder or onto the old road, because that single detail decides your airport run.
For this audience the single most important specification is secure parking. Street parking has effectively disappeared from Kilimani, Westlands and Parklands, and Nairobi County charges for on-street bays where they exist. A dedicated, controlled bay is therefore both a security question and a daily-logistics one — most vehicle-related incidents tenants report happen in uncontrolled parking, not on the road.