Medieval Tallinn is a very nice city to visit, but its old town is terribly crowded at the peak season. It was built for a couple of thousand inhabitants, and when there are several large cruise ships at the port at the same time... you know. May I suggest some less traditional times to visit Tallinn (applies as well to visiting Helsinki, Stockholm, St. Petersburg, Riga), when crowds are gone, but weather can be surprisingly good:

1. May. Weather is usually very nice, yet the town is nearly not as crowded as in high summer. Days are looong, nights are barely there. Can be a little cool at night, though.

2. October. A very underappreciated month, yet the likelihood for a nice and warm Indian summer is pretty high. Fall colors are anyway guaranteed! Even if it's not Indian summer, it is rarely really cold, and it rains much less than in September or August. Avoid the last week of October though, as switch to winter time makes evenings very dark.

3. February/early March. If you wish to experience a nice Nordic winter, that's the time to go, NOT Christmas time. In December, you are guaranteed a 6-hour daylight and typically no sun at all - yet the chances for a decent snow and related fairytale pictures are about 20%. Whereas typical February weather has crispy and cold nights (-15 C is common) and brightly sunny, pleasant days. Evenings are long and bring some of the best light conditions for pictures.

Enjoy!

Are the Finns still coming over by thousands for binge drinking every weekend? My experience from pre-Euro times is that during the weekend it was very unpleasant to downright impossible to move in the old town, we were even hassled inside our hotel. My advice is: visit during the week (Monday to Thursday) and avoid the weekend.