That depends on how much they’re asking and what you want to use the bike for. As it’s a single speed you need 2 brakes so if the seller says brakes can be fitted, and it’s a good price then yes, it’s a good buy for some urban not too hilly cycling.
The brakes can be fitted on the front (would ride fixed), but there is also a safety concern about not knowing wether the bike was remade good enough. He’s asking 200£
That depends on how much they’re asking and what you want to use the bike for. As it’s a single speed you need 2 brakes so if the seller says brakes can be fitted, and it’s a good price then yes, it’s a good buy for some urban not too hilly cycling.