Considering that the top teams (from the 5 top leagues) were threatening from breaking free from UEFA and creating a league on their own, I guess they had to give them something. That something is additional spots for teams from their leagues. In all honestly, that is better. The matches are more competitive when it's between top teams. I would rather see an additional English/Spanish/Italian... team than one from Hungary who will end up losing all their matches with 3+ goals difference. Hungary was just an example. Any other country, whose league is not on par with the best, works as well. It might not be fair, but it's business.   

I checked the official UEFA website and many matches will be played on neutral venue indeed:

1st leg:
Leipzig - Liverpool in Hungary
Atl. Madrid - Chelsea in Romania
Mönchengladbach - Man. City in Hungary
 
2nd leg:
Everyone plays at their home venue.