My personal feeling is that a blog is only worth it for longer trips...say 3 or more weeks. Otherwise it takes too much effort as a percentage of available time to vacation/explore. On longer trips, it's ok to spend time looking for internet access in remote places, and/or WiFi hotspots (which require you to carry your own smartphone, tablet, or laptop), etc. I view that as a chore, but then again some people really enjoy documenting+publishing in real-time, so I guess it depends on your perspective. If you're traveling with a smartphone and the appropriate charging adapter, WiFi spots should be pretty ubiquitous in urban Europe nowadays and there's plenty of apps to make blogging relatively painless. I typically prefer to travel with my trusty DSLR and even more reliable Moleskine notebook to take down notes/observations/sketches/etc.--using my smartphone only to keep in touch via short text messages and for emergency calls--and then spend the time putting it all together into a summary page with photos on my website when I get back home.