The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
Acts Chapter 28
Appii
The market of Appius.
a soldier
The soldier that guarded him. (Act 24:23); (Act 27:3).
salvation
(See Scofield) - (Rom 1:16).
his own hired house
It has been much disputed whether Paul endured two Roman imprisonments, from A.D. 62 to 68 or one. The tradition from Clement to Eusebius favours two imprisonments with a year of liberty between.
Erdman (W.J.) has pointed out the leaving of Trophimus sick at Miletus, mentioned in (Ti2 4:20) could not have been an occurrence of Paul's last journey to Jerusalem, for then Trophimus was not left; (Act 20:4); (Act 21:29) nor of the journey to Rome to appear before Caesar, for then he did not touch at Miletus.
To make this incident possible, there must have been a release from the first imprisonment, and an interval of ministry and travel.