The focus of the town of Soller is the Plaça Constitució which is surrounded by cafés and has trees and a fountain in its centre. The tram passes through the Plaça on its way to and from the main station (shown below) which has been restored to incorporate a museum of Picasso porcelain (he's having a bit of a laugh) and prints by Joan Miró. 

The church of Sant Bartomeu facing the east side of the Plaça is flanked by the town hall and the Banco de Sóller, a Modernista building, designed by Joan Rubió i Bellver, a follower of Antoni Gaudí. 

The church dates from the 13th century but the current interior structure is now largely baroque.

When we arrived the square was heaving with tourists and very hot.  

(We later discovered that the most quiet and peaceful spot for a snack is the inexpensive and tasteful bar at the station.  Presumably most people head straight for the town or the tram to the Port.)

Josep Rubio i Bellver, also designed the modernista house called Ca'n Prunera (completed 1911) which is now a museum,  situated about 2 minutes walk from the placa. Ca'n Prunera boasts a permanent art collection with works by national and international artists such as Picasso, Miró, Matisse, and Magritte, as well as local artists. We didn't have the inclination to visit on this occasion so cannot comment.