Conrado,
possibly we meet on your tour, as I will start end of Mai from airport of Constanta - Tulcea, then following the Danube upwards to Vienna.

My question beside your itinerary to Odessa: why do you pass via Constanta, a more unpeasant industrial zone without any highlight? Following the Danue downstream to Tulcea may be reconsidered possibly.
Regards
Guenter

---always a thumb's distance below the rim!