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We study milliarcsecond-scale properties of the persistent radio counterpartto FRB 121102 and investigate the spectro-polarimetric properties of a brightburst. For the former, we use European VLBI Network (EVN) observations in 2017at 1.7 and 4.8 GHz. For the latter, we re-analyse the 1.7-GHz data from the100-m Effelseberg telescope taken in 2016. These observations predate otherpolarimetric studies of FRB 121102, and yield the highest burst Faradayrotation measure (RM) to date, RM = 1.27*10^5 rad m^-2, consistent with thedecreasing RM trend. The fractional polarization of the burst emission is 15%at 1.7 GHz. This can be reconciled with the high fractional polarization athigher frequencies if the Faraday width of the burst environment is 150 radm^-2 - a bare 0.1% of the total Faraday rotation. The width may originate fromminor non-uniformities in the Faraday screen, or from effects in the emittingregion itself. The upper limit on the persistent source size is 1 pc, barelyconsistent with a young supernova (SN) scenario. The flux variability limit of<10% is not in favor of the young SN scenario, and challenges otherinterpretations as well. The fractional polarization of the faint persistentsource is constrained at <25% at 4.8 GHz ruling out a common origin with thehighly polarized individual bursts.

FRB 121102: drastic changes in the burst polarization contrasts with the stability of the persistent emission