Coventry is exceptionally well connected by train. London Euston to Coventry takes under an hour on Avanti West Coast services, which run roughly every thirty minutes. From Birmingham New Street the journey is just 20 minutes, with trains departing every quarter-hour. This makes Coventry a natural day trip from either city, or a practical stop between the two.
Coventry station is on the southern edge of the city centre, about a twelve-minute walk from Broadgate. There is no tram or metro; the walk is straightforward and signposted. If you arrive by car, the city centre has several multi-storey car parks, though parking at the railway station itself is expensive.
The nearest airports are Birmingham (BHX), about 20 minutes away by car, and East Midlands, 40 minutes away. Neither has a direct rail link to Coventry — you'd connect through Birmingham.