We will be staying 3 nights in Budapest and would like recommendations on a hotel with the best location for easy access to transportation and attractions. Looking for moderate price options. Location is most important but nice, clean and friendly are also desired. Doesn't have to be fancy. Thank you!
A good list here. All those listed by the OP are in a good location.
https://community.ricksteves.com/travel-forum/hungary/rs-forum-favorite-hotels-and-their-cost
Probably the best located budget hotel: Medosz Hotel Budapest (4.2) = 63€ / night https://medoshotel.hu/