I've stayed at all Radisson properties in Tallinn for multiple times and must say that they are all pretty ok for the price. I've always found Park Inn's breakfast better than expected and the Radissons' breakfasts worse than expected. I think all have always upgraded me (gold) and breakfast has always been included or added for free. When Park Inn still was 9000pts/nite it was very good redemption value, still ok at 15k pts but not a steal. Tallinn center is pretty compact so location-wise there is not that much difference which one you choose. Absolutely walkable from Old Town and Ferry terminal, unless the weather is really bad.