Europe is beautiful, and there are so many places to see so i should suggest you to cover 2-3 countries max in one go. Like you can do France and Switzerland or Spain and Portugal. Germany, Netherlands and Belgium or else Prague, Vienna, Budapest and Bratislava. By the way, April is also a good time to visit these places.
I would prefer you cover 1 country fully. or max 2, but it also depends on which country you're travelling to. Places like Budapest, prague can be clubbed together along with 1 more country as they're smaller cities. so it totally depends on where. 10 countries, however is a bad idea.
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