Canon 844, #2, says that, as often as necessity requires it or genuine spiritual advantage recommends it, and provided that the danger of error or indifferentism is avoided, the faithful, for whom it is physically or morally impossible to go to a Catholic minister, may receive the Sacraments of Penance, Eucharist and Anointing of the Sick from non-Catholic ministers in whose Churches these sacraments are valid.
Whatever else might be said, I think it would be very unlikely that a Catholic living in ordinary circumstances in a large city would find it physically or morally impossible to receive the Eucharist from a Catholic minister.
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