Access to BudapestThe easyest way to reach Budapest is by plane, but travelling by train is also possible.
The recommended way to go to either the city center or to the workshop location is to either take a taxi or an airport shuttle. The official taxi company for airport transports is Főtaxi, and one trip should cost between 20-22 Euros. The taxis should have POS terminals so you can pay by card, but it is advised to check that with the driver. The airport shuttle is cheaper, a return ticket is about 18-20 Euros. You can find more details at http://www.airportshuttle.hu.
Access to the workshopThe Morgan Stanley office is located at Lechner Ödön fasor 8. Closest to the office is the tram no. 2 stop called "Haller utca". The office is also in walking distance from Boráros tér, where you can take trams 2, 4, 6 and several buses.
Check out http://www.bkv.hu for public transport information, including a route planner. Google Maps also offers route planning for public transport.