This is probably the oldest surviving house in Port Elizabeth and was built by Rev Francis McClelland of the Church of England, who arrived in 1820 with the Irish party under William Parker. McLelland established himself in Port Elizabeth where, in April 1825, the Governor of the Cape granted him land for an Anglican Church. McLelland was an influential figure in early Port Elizabeth, started its first school and delivered addresses at nearly every important public function. It was declared a National Monument under old NMC legislation on 2 February 1962

.Also Called Seven Castle Hill or No 7 Castle Hill. The Georgian house, now a museum is one of the oldest houses in the city and is a fine example of how the English style was interpreted into provincial outposts in the early 19th century.Museum in a quaint cottage with 1800s furnishings, a period kitchen, lace displays & a fairy garden. The two storey house was originally built as the home for Rev. Francis McCleland. Two similar Georgian period houses, known as the "Sterley cottages", are located at no.10 and no.12 Castle Hill, across the road. These are single storey houses and remain private residences. These were restored with some alterations in 1974 by the architect Hurbert Tanton. All three of the houses were declared National Monuments now provincial Heritage Sites. It is one of the best examples of this style of dwelling in Port Elizabeth. Renovations were done by, Harold B. Smith. 

Geolocation
-33° 56' 12.7944", 25° 36' 50.9404"
Further Reading
https://www.sahistory.org.za/.../first-1820-british-settlers-arrive-south-africa
https://www.sahistory.org.za/.../robert_ross_status_and_respectability_in_the_ capbookos.org_.pdf
https://www.sahistory.org.za/sites/default/files/.../descriptivehandb00nobl.pdf
https://www.sahistory.org.za/topic/port-elizabeth-timeline-1799-1986
https://www.sahistory.org.za/article/colonial-history-port-elizabeth