<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by ShuttleBug:
Pros and cons are that the CP available with UA 50% coupons and LH bus from FRA airport direct to CP</font>
The LH bus actually goes to the Marriott too (I thought it actually went only to the Marriott but could be wrong...). In any case a cab ride would be quick and cheap from one to the other. If I were you and not trying to get Marriott points, I'd go with the CP. Its closer to the action and is serviceable for a first visit to Heidelberg, esp. if cheaper.
ShuttleBug -- Feel free to email me privately if you have any more questions or want more tips.