Another question I would appreciate help with. Arriving Nepliget bus station at 7:40 PM on flixbus. (Thank you for previous advice on this!) Staying at Hilton Garden Inn, Lazar Utica 11-13. This would be a long walk so need advice on best transportation from bus station to hotel. Thank you!

If you Google Nepliget Bus Station to Lazar Utica 11-13, it will tell you that the M3 metro line provides a direct connection.

You can take the metro (M3) to Kalvin square and from Kalvin square the metro replacement bus to Deak square (only 2 stops), Lazar street is not far (5min walk) from that Bus stop...Have a nice stay in Budapest!

The metro line No 3 ( M3) is under construction at the moment. You can take it only to Kalvin tér, 3rd stop. At the very same bus stop change for the bus No 9, and get of at Szt. Istvan Bazilika. From the bus stop only 5 min walking distance