It is going to be a tough night for West Ham. They lost the first leg in their own stadium by 1-2 and they have a more difficult work to do this time. But I still want to trust West Ham about making it. After I saw that comeback from Real Madrid in the Champions League, this is even more possible to do for West Ham.

Frankfurt are a good attacking team now so West Ham will need to be better at defending.
I think they are two teams where the gun factor is quite high. Sometimes you have that you absolutely do not want a team to advance to the next round, but with these 2 teams you will not be bothered by that. The team playing at home does have the advantage, of course, but we have already seen at Barcelona-Frankfurt that you couldn't really speak of a home advantage because of 30,000 Frankfurt supporters who traveled with them.
